Their song is unending praise for the majestic God on heaven’s throne. It’s what heavenly creatures have done since the beginning (Job 38:7; Psalm 103:20; Isaiah 6:3) and it befits the glorious Creator. In their endless song of praise they also explain why they guard God’s throne so zealously; he is holy, holy, holy, and any who would approach will be consumed!
8 And the four living creatures, each of them with six wings, are full of eyes all around and within, and day and night they never cease to say, “Holy, holy, holy, is the Lord God Almighty, who was and is and is to come!”