Revelation 6:9

6:9 Now when the Lamb opened the fifth seal, I saw under the altar the souls of those who had been violently killed because of the word of God and because of the testimony they had given.

Revelation 8:5

8:5 Then the angel took the censer, filled it with fire from the altar, and threw it on the earth, and there were crashes of thunder, roaring, flashes of lightning, and an earthquake.

Revelation 11:1

The Fate of the Two Witnesses

11:1 Then a measuring rod like a staff was given to me, and I was told, “Get up and measure the temple of God, and the altar, and the ones who worship there.

Revelation 14:18

14:18 Another angel, who was in charge of the fire, came from the altar and called in a loud voice to the angel who had the sharp sickle, “Use your sharp sickle and gather the clusters of grapes off the vine of the earth, because its grapes are now ripe.”