John Mark
Mark 4:29ESV·traditional attribution

But when the grain is ripe, at once he puts in the sickle, because the harvest has come.”

Matthew Henry Presbyterian @wholebiblehenry

The lessons which our Saviour designs to teach us here by parables and figurative expressions are these: - I. That those who are good ought to consider the obligations they are under to do good; that is, as in the parable before, to bring forth fruit.

Commenting on Mark 4:21-34

John Gill Reformed Baptist @doctorgill

But without a parable spake he not unto them,.... For the above reason, as well as for the accomplishment of Scripture; See Gill on Mat 13:34, Mat 13:35. And when they were alone, he expounded all things to his disciples: after they returned with him from the sea side, to the house in Capernaum, where he usually was when there; see Mat 13:36.

Albert Barnes Presbyterian @notesbybarnes

Verse 29. Immediately he putteth in the sickle. This is the way with the husbandman. As soon as the grain is ripe, it is cut down. So it is often with the Christian. As soon as he is prepared for heaven, he is taken there.