The 24 Elders are affirming of the power of Jesus' blood with "amen," because they have experienced it.
Their testimony is revealed in the Scripture so that we can be strengthened in faith. We will be joining them soon and shall sing a redemption song before the throne of God.

Rev. 15:3-4 "And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.

Who shall not fear thee, O Lord, and glorify thy name? for thou only art holy: for all nations shall come and worship before thee; for thy judgments are made manifest."

Amen; Alleluia!

What do we know about the four living creatures in relation to the 24 Elders?

The four living creatures formed the innermost circle with the 24 Elders and angelic host forming the outer circles surrounding the throne of God in Rev. 4:6-7.

We find in Ezek. 1 and Isa. 6 that the four living creatures appear to be the leaders of the heavenly court. And we see them throughout Revelation that they have their function: they guide heavenly worship in 5:6-7;
sent out the four horsemen of the Apocalypse in 6:1-8,
and participate in worship in 7:11.
One of the four living creatures gives the golden bowl to the seven angels in 15:7.

Their final appearance is in 19:4 in that they fall before God and cry out "Amen, hallelujah," together with the 24 Elders.

In conclusion, the 24 Elders are the wave sheaf that Jesus took from the earth as a firstfruit of harvest for the redemption of man. (See Lev. 23:10-12 for reference). They are saying, "Amen, hallelujah" since they are there first before we get there.

"The grace of our Lord Jesus Christ be with you all. Amen." (Rev. 22:21).

What you said about the 24 Elders in your last post here makes the most sense to me.

In the light of Rev 4-5, the throne of God is the main focus where the courts of heaven is opened for judgment. Some scholars think the heavenly beings are summoned for the inauguration of Jesus Christ when He ascended to heaven. I believe such interpretation is far from its context.

Why do I think so? The thing is, Jesus never gave up His kingship; even at His incarnation, He was sought as the King by the Wisemen. Then, why the heavenly beings would necessitate to come before the throne and acknowledge His kingship? Was He, not the King of the universe always, that He must be inaugurated as a King?

When Jesus had a triumphant entry to Jerusalem riding upon an ass, He was the King; "behold, thy King cometh unto thee."

Zech. 9:9 "Rejoice greatly, O daughter of Zion; shout, O daughter of Jerusalem: behold, thy King cometh unto thee: he is just, and having salvation; lowly, and riding upon an ass, and upon a colt the foal of an ass."

Jesus said, His kingdom does not belong to this world when He was demanded to answer "Art thou the King of the Jews?" (John 18:33) by Pilate.

"Jesus answered, My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence." (John 18:34).

Jesus always has been the King of the kingdom of righteousness even at His incarnation in this world.

"But unto the Son he saith, Thy throne, O God, is for ever and ever: a sceptre of righteousness is the sceptre of thy kingdom." (Heb. 1:8)

The throne of God is where righteousness and judgment are the foundation of it.

Psalms 97:2 "righteousness and judgment are the habitation of his throne."

Rev. 4-5 illuminate much deeper insight in the perspective of judgment about the worth of the Lamb slain from the foundation of the world to redeem humanity.

Scripture testifies that the 24 Elders ascended to heaven when Jesus resurrected and ascended to the throne of God.

We see the vivid picture of their position in Rev. 4-5 as a close-up view specifies. The 24 Elders followed Jesus to sit on the throne as indicated in the wave sheaf offering at the feast day of the OT in Lev. 23.

In the light of this, John saw the throne, and one sitting implied Trinity's presence. The "one sat" on the throne does not mean only the Father God. In the close-up, the Lamb that was slain from the foundation of the world is there in the midst of the throne and is found worthy of losing the seven-sealed book.

In Rev. 4, "a throne" was first introduced, expanding its view in subsequent texts and chapters.

The text, "in the midst of the throne" (Rev. 4:6), implies there is One in the middle and the Others in His right and left sides. The same idea repeats in Rev. 5:6, "in the midst of the throne," which indicates One sat on the throne is the Lamb that was slain.

It is more apparent in Rev. 7:17, which says, "For the Lamb which is in the midst of the throne."

In short, the Trinity occupies the throne that John saw in Rev. 4, and the 24 Elders are invited to sit on the 24 thrones after Jesus.

I understand that the 24 Elders are a sample of redeemed people from the earth through the blood of Jesus Christ.

Revelation has a beautiful pattern of the Trinity from the outset of the prophecy unfolding (see Rev. 1:4-5). The allusion of the Triune God reoccurs at the throne room in Rev. 4-5.

In other words, the introduction of the Seven Churches has the allusion of the Triune God,
and the introduction of the Seven Seals, which is Chap. 4-5, has the same allusion of the Triune God on the throne.

It is interesting to note that the Triune God said, "let us make man in Our image," in Genesis 1, which is the beginning of the Scripture as the introduction.

Thus, I perceive "one sat on the throne" (Rev. 4:2) indicates the presence of the Trinity.

I prefer the Biblical word "Godhead" over the theological word "Trinity."

Yes, I agree. That way it works for those who believe in God and Jesus as the Godhead and also for those who believe in the trinity.

Rev. 4:2-3 "And immediately I was in the spirit: and, behold,
a throne was set in heaven,
and one sat on the throne.

And he that sat was to look upon like a jasper and a sardine stone:
and there was a rainbow round about the throne,
in sight like unto an emerald."

Ellen G White associated the rainbow with the presence of Jesus on the throne.

Patriarch and Prophets p. 87
"In heaven the semblance of a rainbow encircles the throne and overarches the head of Christ.
The prophet says, ?As the appear- ance of the bow that is in the cloud in the day of rain,
so was the appearance of the brightness round about [the throne].

This was the appearance of the likeness of the glory of Jehovah.? Ezekiel 1:28.
The revelator declares, ?Behold, a throne was set in heaven, and one sat on the throne....

There was a rainbow round about the throne, in sight like unto an emerald.? Revelation 4:2, 3.

When man by his great wickedness invites the divine judgments,
the Saviour, interceding with the Father in his behalf, points to the bow in the clouds,
to the rainbow around the throne and above His own head,
as a token of the mercy of God toward the repentant sinner."

The color of a Jasper stone represents the Father God;
the color of a sardine stone represents the Son Jesus Christ;
the color of an emerald stone represents the Holy Spirit.

The corresponding vision in Rev. 20 has three books: Rev. 20:11-12

"And I saw a great white throne, and him that sat on it,
from whose face the earth and the heaven fled away;
and there was found no place for them.

And I saw the dead, small and great, stand before God;
and the books were opened: and another book was opened,
which is the book of life:
and the dead were judged out of those things
which were written in the books, according to their works."

"the books were opened" indicate two books that are mentioned in the OT.
1). The book of sin: Jer. 17:1
2). The book of remembrance: Mal. 3:16

"another book" is 3). "the book of life," which mentions seven times in Revelation.

The book of life belongs to the Father God.
The book of sin belongs to the Holy Spirit.
The book of remembrance belongs to Jesus Christ.

In the heavenly courts, every soul is investigated in judgment to determine whether he or she is covered
by the cleansing blood of Jesus Christ, before the sealing for a salvation. This is contemporary to our lives.
It is clearly revealed to us in the vision of the throne room in Rev. 4-5.

The corresponding vision of the reviewing judgment in the great white throne indicates the investigative judgment
involves with the three books; the book of sin, remembrance and the book of life.

Rev. 4-5 is the vision of the throne room.
Rev. 20 is the vision of the great white throne.

Both visions are about the judgment of God; one is about the investigative judgment, and the other is the reviewing judgment from the throne room of God.

Psalm 97:2 "...righteousness and judgment are the habitation of his throne."

The most "worship" word appears in the book of Revelation than any other books of the Bible.

The striking thing is that Rev. 4-5 of the throne room vision graphically portrays dramatic worship by the heavenly assembly.

Rev. has another throne room vision in Rev. 20:11-12, which complements the throne room vision of Rev. 4-5.

Rev. 20:11-12 "And I saw a great white throne, and him that sat on it, from whose face the earth and the heaven fled away; and there was found no place for them.

And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works."

Apostle John saw the great white throne where the recording of God's judgment is open to view to the redeemed saints during the millennium.

Two books and another book were opened=>the seven-sealed book.
Two books + the book of life => seven-sealed book on the right hand of God(Rev. 5:1)
Book of sin: Jer. 17:1 "The sin of Judah is written with a pen of iron, and with the point of a diamond: it is graven upon the table of their heart, and upon the horns of your altars"

Book of remembrance: Mal. 3:16 "Then they that feared the Lord spake often one to another: and the Lord hearkened, and heard it, and a book of remembrance was written before him for them that feared the Lord, and that thought upon his name."

Book of life: Rev. 21:27 "And there shall in no wise enter into it any thing that defileth, neither whatsoever worketh abomination, or maketh a lie: but they which are written in the Lamb's book of life."

The great white throne has a clear connection to the throne room of Rev. 4-5 where the judgment of God is happening before the Second Coming. In other words, it is Pre-Advent judgment.

Rev. 20:11-12 reveals a time of Reviewing the judgment of God during the millennium.

Conversely, the heavenly beings are worshipping God before the throne, for it is found that the Lamb of God is worthy to be praised for the redemption of the lost humanity.

The heavenly worship is the pattern we ought to follow in the worship of God.
1. Who are we worshiping?
2. Do we have a faith in Jesus, the substitute atoning Sacrifice?
3. Are we in an assembly of God's people?