Mark 1:4

John baptized in the wilderness, 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 3:1-2

AND in those days came John the Baptist preaching in the wilderness of Judea, saying,

Matthew 3:6

and were baptized by him in the river Jordan, confessing their sins.

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;

Luke 3:2-3

under the chief priest Annas, and Caiaphas, the word of God came to John the son of Zachariah, in the wilderness.

John 3:23

And John also was baptizing at AEnon, near Salim, because there were many waters there; and they came and were baptized,

Acts 13:24-25

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

Acts 19:3-4

And he said to them, With what then were you baptized? And they said, With John's baptism.

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

John did baptize in the wilderness, and preach the baptism of repentance for the remission of sins.

Remission

Bible References

Did

Matthew 3:1
AND in those days came John the Baptist preaching in the wilderness of Judea, saying,
Luke 3:2
under the chief priest Annas, and Caiaphas, the word of God came to John the son of Zachariah, in the wilderness.
John 3:23
And John also was baptizing at AEnon, near Salim, because there were many waters there; and they came and were baptized,
Acts 13:24
John having preached before his coming the baptism of a change of mind to all the people of Israel.
Acts 19:3
And he said to them, With what then were you baptized? And they said, With John's baptism.

Remission

Acts 22:16
And now, why do you delay? Arising, baptize and wash away your sins, calling on his name.