And the four and twenty elders and the four beasts - See the notes on Revelation 4:4, Revelation 4:6-7. As representatives of the church, and as interested in its welfare, they are now introduced as rejoicing in its final triumph, and in the destruction of its last foe.
Fell down - Prostrated themselves - the usual posture of worship.
And worshipped God that sat on the throne - Revelation 4:2-3, Revelation 4:10. That is, they now adored him for what he had done in delivering the church from all its persecutions, and causing it to triumph in the world.
Saying, Amen - See the notes on Matthew 6:13. The word here is expressive of approbation of what God had done; or of their solemn assent to all that had occurred in the destruction of the great enemy of the church.
Alleluia - See the notes on Revelation 19:1. The repetition of this word so many times shows the intenseness of the joy of heaven in view of the final triumph of the church.