5 All the country of Judea and all those of Jerusalem went out to him. They were baptized by him in the Jordan river, confessing their sins.
*Minor differences ignored. Grouped by changes, with first version listed as example.
All the land - See on Matthew 3:4-6 (note).
Confessing their sins - It was an invariable custom among the Jews to admit no proselyte to baptism, till he had, in the most solemn manner, declared that he forever had renounced all idolatrous worship, all heathenish superstitions, and promised an entire and unreserved submission to the law of Moses. This was necessary for a proselyte adult - a child dedicated to God by baptism must be brought up in this faith.
And there went out unto him all the land of Judea,.... The people of the land, a great number of them:
and they of Jerusalem; the inhabitants of Jerusalem, hearing of this new preacher, the new doctrine that he taught, and the new ordinance that he administered:
and were all baptized of him in the river Jordan, confessing their sins; that is, as many of them as were brought to a sight and sense of their sins, and made a confession of them, these he baptized, or immersed, in the river Jordan; for certain it is, that there were many of the Pharisees and Sadducees who came, whom he rejected; See Gill on Matthew 3:5, Matthew 3:6, Matthew 3:7.
There went out to him. See notes on Matthew 3:5-6.
*More commentary available at chapter level.