18 And another angel having authority over the fire came out of the altar, and he called in a loud cry to the one having the sharp sickle, saying, “Put forth your sharp sickle, and gather the clusters from the vine of the earth, because its grapes have fully ripened.”
Revelation 14:18 Cross References - BLB
Revelation 6:9-10
9 And when He opened the fifth seal, I saw under the altar the souls of those having been slain because of the word of God, and because of the testimony which they had upheld.
10 And they were crying in a loud voice, saying, “Until when, O Lord, holy and true, do You not judge and avenge our blood from those dwelling upon the earth?”
Revelation 14:15-16
15 And another angel came out of the temple, crying in a loud voice to the One sitting on the cloud, “Put forth Your sickle and reap, because the hour to reap has come, because the harvest of the earth has ripened.”
16 And the One sitting upon the cloud put forth His sickle upon the earth, and the earth was harvested.
Revelation 16:8
8 And the fourth poured out his bowl upon the sun, and there was given to it to scorch men with fire.