Mark 1:4

John came baptizing in the wilderness, and proclaiming a baptism of reformation -- to remission of sins,

Luke 1:77

To give knowledge of salvation to His people In remission of their sins,

Matthew 3:1-2

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

Matthew 3:6

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

Matthew 3:11

'I indeed do baptize you with water to reformation, but he who after me is coming is mightier than I, of whom I am not worthy to bear the sandals, he shall baptize you with the Holy Spirit and with fire,

Luke 3:2-3

Annas and Caiaphas being chief priests -- there came a word of God unto John the son of Zacharias, in the wilderness,

John 3:23

and John was also baptizing in Aenon, nigh to Salem, because there were many waters there, and they were coming and were being baptized --

Acts 10:37

ye -- ye have known; -- the word that came throughout all Judea, having begun from Galilee, after the baptism that John preached;

Acts 13:24-25

John having first preached, before his coming, a baptism of reformation to all the people of Israel;

Acts 19:3-4

and he said unto them, 'To what, then, were ye baptized?' and they said, 'To John's baptism.'

Acts 22:16

and now, why tarriest thou? having risen, baptize thyself, and wash away thy sins, calling upon the name of the Lord.

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 cometh John the Baptist, proclaiming in the wilderness of Judea,
Luke 3:2
Annas and Caiaphas being chief priests -- there came a word of God unto John the son of Zacharias, in the wilderness,
John 3:23
and John was also baptizing in Aenon, nigh to Salem, because there were many waters there, and they were coming and were being baptized --
Acts 10:37
ye -- ye have known; -- the word that came throughout all Judea, having begun from Galilee, after the baptism that John preached;
Acts 13:24
John having first preached, before his coming, a baptism of reformation to all the people of Israel;
Acts 19:3
and he said unto them, 'To what, then, were ye baptized?' and they said, 'To John's baptism.'

Remission

Acts 22:16
and now, why tarriest thou? having risen, baptize thyself, and wash away thy sins, calling upon the name of the Lord.