Matthew 3:5-6

3:5 Then people from Jerusalem, as well as all Judea and all the region around the Jordan, were going out to him, 3:6 and he was baptizing them in the Jordan River as they confessed their sins.

Mark 1:4-5

1:4 In the wilderness John the baptizer began preaching a baptism of repentance for the forgiveness of sins. 1:5 People from the whole Judean countryside and all of Jerusalem were going out to him, and he was baptizing them in the Jordan River as they confessed their sins.

Luke 3:7

3:7 So John said to the crowds that came out to be baptized by him, “You offspring of vipers! Who warned you to flee from the coming wrath?