Revelation 14:18
And another angel came out from the altar, which had power over fire; and cried with a loud cry to him that had the sharp sickle, saying, Thrust in thy sharp sickle, and gather the clusters of the vine of the earth; for her grapes are fully ripe.
Cross-reference
In Revelation 14:15, a similar command is given to reap the grain harvest — here the vineyard harvest parallels that judgment scene.
Revelation 14:17 introduces the angel with the sickle — the one who is then commanded in 14:18 to reap the vine.
In Revelation 14:16, the grain harvest is executed — highlighting the parallel but distinct judgment of the vine that follows.
Revelation 6:10 records martyrs crying for judgment; in 14:18, an angel from that altar initiates the harvest judgment they requested.
In Revelation 6:9, martyrs' souls are under the altar — the same heavenly altar from which the angel with authority over fire comes in 14:18.
Revelation 16:1 also has a voice from the temple commanding angels to pour out God's wrath — similar pattern of divine command for judgment.
Joel 3:13 is the prophetic source for this harvest judgment imagery — both grain and wine press, here applied to the vine.
Jeremiah 25:30 describes God shouting against the earth like those treading grapes — precursor to the winepress judgment that follows this verse.
Jeremiah 6:9 uses the same grape-gathering imagery for judgment on Israel — here applied to the whole earth's vine.