Revelation 14:18
And another angel came out from the altar--he who had power over fire--and he spoke in a loud voice to him who had the sharp sickle, saying, "Use your sharp sickle, and gather the bunches from the vine of the earth, for its grapes are now quite ripe."
Revelation 16:8
Then the fourth angel poured his bowl on to the sun, and power was given to it to scorch men with fire.
Revelation 6:9-10
When the Lamb broke the fifth seal, I saw at the foot of the altar the souls of those whose lives had been sacrificed because of the word of God and of the testimony which they had given.
Revelation 14:15-16
And another, an angel, came out of the sanctuary, calling in a loud voice to Him who sat on the cloud, and saying, "Use your sickle and reap the harvest, for the hour for reaping it has come: the harvest of the earth is over-ripe."