Revelation 14:18
And another angel who had authority over the fire [went out] from the altar, and he called out with a loud voice to the one who had the sharp sickle, saying, "Send out your sharp sickle and harvest the clusters of grapes from the vine of the earth, because its grapes are at their prime!"
Joel 3:13
Send forth [the] sickle, for the harvest is ripe! Go tread, for [the] winepress is full! The vats overflow, because their evil [is] great!
Revelation 16:8
And the fourth poured out his bowl on the sun, and it was granted to it to burn up people with fire.
Revelation 6:9-10
And when he opened the fifth seal, I saw under the altar the souls of those who had been slaughtered because of the word of God and because of the testimony which they had,
Revelation 14:15-16
And another angel came out of the temple, crying out with a loud voice to the one seated on the cloud, "Send out your sickle and reap, because the hour to reap has come, because the harvest of the earth is ripe!"