Luke 3:3

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

Luke 1:77

To give knowledge of salvation to his people, by the remission of their sins,

Matthew 3:5-6

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

Matthew 3:11

I indeed baptize you with water to repentance: but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: he shall baptize you with the Holy Spirit, and with fire:

Mark 1:4-5

John was baptizing in the wilderness, and preaching the baptism of repentance, for the remission of sins.

John 1:28

These things were done in Bethabara beyond Jordan, where John was baptizing.

John 1:31-33

And I knew him not: but that he should be made manifest to Israel, therefore am I come baptizing with water.

John 3:26

And they came to John, and said to him, Rabbi, he that was with thee beyond Jordan, to whom thou didst bear testimony, behold, the same baptizeth, and all men come to him.

Acts 13:24

John having first preached, before his coming, the baptism of repentance to all the people of Israel.

Acts 19:4

Then said Paul, John verily baptized with the baptism of repentance, saying to the people, That they should believe on him who should come after him, that is, on Christ Jesus.

Acts 22:16

And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.

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 Jordan,
Mark 1:4
John was baptizing in the wilderness, and preaching the baptism of repentance, for the remission of sins.
John 1:28
These things were done in Bethabara beyond Jordan, where John was baptizing.
John 3:26
And they came to John, and said to him, Rabbi, he that was with thee beyond Jordan, to whom thou didst bear testimony, behold, the same baptizeth, and all men come to him.

Preaching

Matthew 3:6
And were baptized by him in Jordan, confessing their sins.
Mark 1:4
John was baptizing in the wilderness, and preaching the baptism of repentance, for the remission of sins.
John 1:31
And I knew him not: but that he should be made manifest to Israel, therefore am I come baptizing with water.
Acts 13:24
John having first preached, before his coming, the baptism of repentance to all the people of Israel.
Acts 19:4
Then said Paul, John verily baptized with the baptism of repentance, saying to the people, That they should believe on him who should come after him, that is, on Christ Jesus.
Acts 22:16
And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.

For

Luke 1:77
To give knowledge of salvation to his people, by the remission of their sins,