Revelation 4:8
And the four living creatures, each of them with six wings, are full of eyes all around and inside — day and night without ceasing they sing, 'Holy, holy, holy, the Lord God Almighty, who was and is and is to come' — the six wings (from Isaiah 6:2) enable swift, eternal service; the unceasing trisagion (holy, holy, holy) echoes Isaiah 6:3 and declares God's absolute transcendence. The temporal formula (who was and is and is to come) emphasizes God's eternal presence, untouched by time.