Charles Ellicott Commentary Revelation 14:18

"And another angel came out from the altar, he that hath power over fire; and he called with a great voice to him that had the sharp sickle, saying, Send forth thy sharp sickle, and gather the clusters of the vine of the earth; for her grapes are fully ripe." — Revelation 14:18 (ASV)

And another angel . . .—Translate: And another angel, . . . he who has authority over the fire. The two scenes—one in Revelation 6:9-10 (the souls crying beneath the altar), the other in Revelation 8:5 (the angel mingling incense with the prayers of the saints)—must be remembered. The angel who had charge of the altar fire, and flung the ashes signifying judgments towards the earth, calls with a loud cry, Send thy sharp sickle, and gather the bunches of the vine of the earth, because her grapes are ripe.