Mark 4:29
As soon as the grain is ripe, he puts the sickle to it, because the harvest has come — the harvest is the kingdom's final culmination, drawing on the harvest imagery of Joel 3:13 and the Son of Man's harvest in Revelation 14:15. The farmer's action at harvest time is decisive and immediate — as soon as the grain is ripe, the sickle goes in. The harvest is not premature (before ripeness) or delayed (past ripeness) but precisely timed by the grain's own readiness. The kingdom will reach its final harvest in God's perfectly calibrated timing, and the sickle of judgment will gather the crop that the sowing and the growing have produced.