“John the Baptizer
In the wilderness.
He was proclaiming
For the forgiveness of sins.”
ἐγένετο Ἰωάνης ὁ βαπτίζων ἐν τῇ ἐρήμῳ κηρύσσων βάπτισμα μετανοίας εἰς ἄφεσιν ἁμαρτιῶν
There is something similar, but not quite the same in all 4 gospel stories. Matthew, chapter 3:1-2, called John the Baptist (βαπτιστὴς) not the Baptizer (ὁ βαπτίζων), but John was in the wilderness, like here, calling for repentance. In Matthew, John also warned the people that the kingdom of heaven was near. Luke, chapter 3:2:3, is actually closer to Mark, since he used the exact same words about John in the wilderness, proclaiming a baptism of repentance for the forgiveness of sins. John, chapter l:19-29, had a long dialogue with John and the priests and Levites about what he was doing. Mark has this simple statement that John the Baptizer, or the one baptizing, appeared (ἐγένετο Ἰωάνης ὁ βαπτίζων) in the wilderness or desert (ἐν τῇ ἐρήμῳ). How and what he did before or after did not matter. He was there proclaiming or preaching a baptism of repentance, a life change, or metanoia (κηρύσσων βάπτισμα μετανοίας) to have sins or faults forgiven or wiped away (ἄφεσιν ἁμαρτιῶν). John tied this repentant change of life style baptism with the forgiving of sins or wiping away of past faults, since he was calling for repentance. John and Jesus are linked in some ways like Aaron and Moses or the later Peter and Paul. One is superior to the other but the other plays an indispensable role.