A. 14 And I looked, and behold a white cloud, and upon the cloud one sat like unto the Son of man, having on his head a golden crown, and in his hand a sharp sickle.
B. 15 And another angel came out of the temple, crying with a loud voice to him that sat on the cloud, Thrust in thy sickle, and reap: for the time is come for thee to reap; for the harvest of the earth is ripe.
C. 16 And he that sat on the cloud thrust in his sickle on the earth; and the earth was reaped.
A’. 17 And another angel came out of the temple which is in heaven, he also having a sharp sickle.
B’. 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.
C’. 19 And the angel thrust in his sickle into the earth, and gathered the vine of the earth, and cast it into the great winepress of the wrath of God. 20 And the winepress was trodden without the city, and blood came out of the winepress, even unto the horse bridles, by the space of a thousand and six hundred furlongs.
Note: there is an obvious parallel between the two harvests but there are also some asymmetries – the first reaper is “one like the son of man” but the second is “another angel”. The angel that instructs the first to reap comes from out of the temple, whilst the second comes from under the altar.