Luke 3:3

And he went into all the region about the Jordan, preaching the baptism of a change of mind for the forgiveness of sins;

Luke 1:77

to give a knowledge of salvation to his people, with a forgiveness of sins,

Matthew 3:5-6

Then went out to him Jerusalem, and all Judea, and all the region about the Jordan,

Matthew 3:11

I indeed baptize you with water to a change of mind; but he that comes after me is mightier than I, whose shoes I am not fit to bear; he shall baptize you with the Holy Spirit, and fire;

Mark 1:4-5

John baptized in the wilderness, preaching the baptism of a change of mind for the forgiveness of sins.

John 1:28

These things occurred in Bethany beyond the Jordan, where John was baptizing.

John 1:31-33

And I knew him not; but that he might be made manifest to Israel, for this reason have I come baptizing with water.

John 3:26

And they came to John and said to him, Rabbi, he that was with you beyond the Jordan, to whom you testified, behold, this [man] baptizes and all men come to him.

Acts 13:24

John having preached before his coming the baptism of a change of mind to all the people of Israel.

Acts 19:4

Paul said, John indeed baptized [administered] the baptism of a change of mind, telling the people to believe on him that was to come after him, that is, on Jesus.

Acts 22:16

And now, why do you delay? Arising, baptize and wash away your sins, calling on his name.

Treasury of Scripture Knowledge

Summary

And he came into all the country about Jordan, preaching the baptism of repentance for the remission of sins;

For

Bible References

The country

Matthew 3:5
Then went out to him Jerusalem, and all Judea, and all the region about the Jordan,
Mark 1:4
John baptized in the wilderness, preaching the baptism of a change of mind for the forgiveness of sins.
John 1:28
These things occurred in Bethany beyond the Jordan, where John was baptizing.
John 3:26
And they came to John and said to him, Rabbi, he that was with you beyond the Jordan, to whom you testified, behold, this [man] baptizes and all men come to him.

Preaching

Matthew 3:6
and were baptized by him in the river Jordan, confessing their sins.
Mark 1:4
John baptized in the wilderness, preaching the baptism of a change of mind for the forgiveness of sins.
John 1:31
And I knew him not; but that he might be made manifest to Israel, for this reason have I come baptizing with water.
Acts 13:24
John having preached before his coming the baptism of a change of mind to all the people of Israel.
Acts 19:4
Paul said, John indeed baptized [administered] the baptism of a change of mind, telling the people to believe on him that was to come after him, that is, on Jesus.
Acts 22:16
And now, why do you delay? Arising, baptize and wash away your sins, calling on his name.

For

Luke 1:77
to give a knowledge of salvation to his people, with a forgiveness of sins,