Mark 1:4; Mark 10:38-39; Mark 11:30

Mark 1:4

4 John the Baptist appeared in the wilderness preaching a baptism of repentance for the forgiveness of sins.

Mark 10:38-39

38 But Jesus said to them, "You do not know what you are asking. Are you able to drink the cup that I drink, or to be baptized with the baptism with which I am baptized?"

39 They said to Him, "We are able." And Jesus said to them, "The cup that I drink you shall drink; and you shall be baptized with the baptism with which I am baptized.

Mark 11:30

30 "Was the baptism of John from heaven, or from men? Answer Me."