A.T. Robertson Commentary Revelation 14:16

"And he that sat on the cloud cast his sickle upon the earth; and the earth was reaped." — Revelation 14:16 (ASV)

Cast (εβαλεν). Second aorist active indicative of βαλλω. No violence by the use of εβαλεν as is seen in Mt 10:34 (βαλειν ειρηνην, to bring peace).

Was reaped (εθερισθη). First aorist passive indicative of θεριζω. Both prophetic aorists again. Christ puts in the sickle as he wills with his own agents (Matthew 9:37f.; 13:39,41).