Mark 1:4
John the Baptist was in the desert (wilderness) telling people to repent (turn away from sin) and be baptized for forgiveness of sins.
Luke 1:77
To give knowledge of salvation to his people in the remission of their sins.
Matthew 3:1-2
John the Baptist appeared in the wilderness of Judea, proclaiming:
Matthew 3:6
They confessed their sins and were baptized by John in the Jordan River.
Matthew 3:11
I baptize you with water because of your repentance. He that comes after me is mightier than I. He will baptize you with Holy Spirit and fire. I am not even good enough to carry his sandals.
Luke 3:2-3
This was in the time when Annas and Caiaphas were chief priests. The word of God was delivered to John the son of Zechariah. He was in the wilderness.
John 3:23
John was also baptizing in Aenon near to Salim, because there was much water there. People came and were baptized.
Acts 10:37
You know that message which began in Galilee and was published throughout all Judea, after the baptism that John preached.
Acts 13:24-25
Before Jesus came John preached the baptism of repentance to all the people of Israel.
Acts 19:3-4
Paul asked: What kind of baptism did you get? They replied: It was the baptism John taught.
Acts 22:16
Wait no longer! Get up and be baptized and have your sins washed away by praying to him.'