Revelation 14:14-16.

By stating through an angel that “the harvest of the earth is fully ripe,” Jehovah emphasizes that the work is urgent. Indeed, “the hour has come to reap”​—there is no time for delay!

6. (a) When did “the harvest season” begin? (b) When did the actual “harvest of the earth” begin? Explain.

⁶ Since John’s vision in Revelation chapter 14 shows Jesus, the Harvester, wearing a crown (verse 14), his appointment as King in 1914 had already taken place. (Dan. 7:13, 14) Sometime after that, Jesus is commanded to start the harvest (verse 15). The same order of events is seen in Jesus’ parable about the harvest of the wheat, where he states: “The harvest is a conclusion of a system of things.” Thus, the harvest season and the conclusion of this system of things began at the same time​—in 1914. Later “in the harvest season,” the actual harvesting began. (Matt. 13:30, 39) Looking back from our vantage point in time, we can see that the harvest began some years after Jesus started ruling as King. First, from 1914 until the early part of 1919, Jesus carried out a cleansing work among his anointed followers. (Mal. 3:1-3; 1 Pet. 4:17) Then, in 1919, “the harvest of the earth” began. Without delay, Jesus used the newly appointed faithful slave to help our brothers see the urgency of the preaching work.