Revelation 14:18

And another angel came out from the altar, who had power over fire, and he cried with a loud cry to him who had the sharp sickle, saying, “Thrust in your sharp sickle and gather the clusters of the vine of the earth, for her grapes are fully ripe.”

Joel 3:13  Put in the sickle, for the harvest is ripe.  Come, go down; for the winepress is full, the vats overflow – for their wickedness is great.”