Luke 3:3

And he came into all the district around the Jordan, preaching a baptism of repentance for the forgiveness of sins;

Luke 1:77

To give to His people the knowledge of salvation
By the forgiveness of their sins,

Matthew 3:5-6

Then Jerusalem was going out to him, and all Judea and all the district around the Jordan;

Matthew 3:11

“As for me, I baptize you with water for repentance, but He who is coming after me is mightier than I, and I am not fit to remove His sandals; He will baptize you with the Holy Spirit and fire.

Mark 1:4-5

John the Baptist appeared in the wilderness preaching a baptism of repentance for the forgiveness of sins.

John 1:28

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

John 1:31-33

I did not recognize Him, but so that He might be manifested to Israel, I came baptizing in water.”

John 3:26

And they came to John and said to him, “Rabbi, He who was with you beyond the Jordan, to whom you have testified, behold, He is baptizing and all are coming to Him.”

Acts 13:24

after John had proclaimed before His coming a baptism of repentance to all the people of Israel.

Acts 19:4

Paul said, “John baptized with the baptism of repentance, telling the people to believe in Him who was coming after him, that is, in Jesus.”

Acts 22:16

Now why do you delay? Get up and be baptized, 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 Jerusalem was going out to him, and all Judea and all the district around the Jordan;
Mark 1:4
John the Baptist appeared in the wilderness preaching a baptism of repentance for the forgiveness of sins.
John 1:28
These things took place in Bethany beyond the Jordan, where John was baptizing.
John 3:26
And they came to John and said to him, “Rabbi, He who was with you beyond the Jordan, to whom you have testified, behold, He is baptizing and all are coming to Him.”

Preaching

Matthew 3:6
and they were being baptized by him in the Jordan River, as they confessed their sins.
Mark 1:4
John the Baptist appeared in the wilderness preaching a baptism of repentance for the forgiveness of sins.
John 1:31
I did not recognize Him, but so that He might be manifested to Israel, I came baptizing in water.”
Acts 13:24
after John had proclaimed before His coming a baptism of repentance to all the people of Israel.
Acts 19:4
Paul said, “John baptized with the baptism of repentance, telling the people to believe in Him who was coming after him, that is, in Jesus.”
Acts 22:16
Now why do you delay? Get up and be baptized, and wash away your sins, calling on His name.’

For

Luke 1:77
To give to His people the knowledge of salvation
By the forgiveness of their sins,