Mark 1:4

John came baptizing in the wilderness and proclaiming the baptism of repentance for forgiveness of sins.

Luke 1:77

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

Matthew 3:1-2

And in those days John the Baptist came, proclaiming in the wilderness of Judea, saying,

Matthew 3:6

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

Matthew 3:11

I indeed baptize you in water for repentance, but the one who comes after me is mightier than I, whose shoes I am not worthy to carry. He will baptize you in the Holy Spirit and with fire.

Luke 3:2-3

in the high priesthood of Annas and Caiaphas, the word of God came to John, the son of Zechariah, in the wilderness.

John 3:23

John also was baptizing in Aenon near Salim, because there was much water there. They came, and were baptized.

Acts 10:37

that spoken word you yourselves know, which was proclaimed throughout all Judea, beginning from Galilee, after the baptism which John preached;

Acts 13:24-25

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

Acts 19:3-4

He said, "Into what then were you baptized?" They said, "Into John's baptism."

Acts 22:16

Now why do you wait? Arise, be baptized, 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 John the Baptist came, proclaiming in the wilderness of Judea, saying,
Luke 3:2
in the high priesthood of Annas and Caiaphas, the word of God came to John, the son of Zechariah, in the wilderness.
John 3:23
John also was baptizing in Aenon near Salim, because there was much water there. They came, and were baptized.
Acts 10:37
that spoken word you yourselves know, which was proclaimed throughout all Judea, beginning from Galilee, after the baptism which John preached;
Acts 13:24
before his coming, when John had first preached the baptism of repentance to all the people of Israel.
Acts 19:3
He said, "Into what then were you baptized?" They said, "Into John's baptism."

Remission

Acts 22:16
Now why do you wait? Arise, be baptized, and wash away your sins, calling on his name.'