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 8:3-5

8:3 Another angel holding a golden censer came and was stationed at the altar. A large amount of incense was given to him to offer up, with the prayers of all the saints, on the golden altar that is before the throne. 8:4 The smoke coming from the incense, along with the prayers of the saints, ascended before God from the angel’s hand. 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 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.”

Isaiah 6:6

6:6 But then one of the seraphs flew toward me. In his hand was a hot coal he had taken from the altar with tongs.

Ezekiel 10:2

10:2 The Lord said to the man dressed in linen, “Go between the wheelwork underneath the cherubim. Fill your hands with burning coals from among the cherubim and scatter them over the city.” He went as I watched.

Ezekiel 10:7

10:7 Then one of the cherubim stretched out his hand toward the fire which was among the cherubim. He took some and put it into the hands of the man dressed in linen, who took it and left.