And the four and twenty elders. "The elders" represent the Church (see on Revelation 4:4); they are those who were made "a kingdom" (Revelation 1:6); they therefore fitly take up the burden of praise to him who has now established his universal and everlasting kingdom.
Which sat before God on their seats; which sit before God on their thrones (Revised Version). Thus they are described in Revelation 4:4. Fell upon their faces, and worshipped God. (So also in Revelation 4:10; Revelation 5:14; Revelation 19:4.