'Baptism' in the Bible

John was there baptizing in the wilderness, proclaiming a baptism of repentance for the forgiveness of sins.

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 that I am baptized with?"

And they said to him, "We are able." So Jesus said to them, "You will drink the cup that I drink, and you will be baptized with the baptism that I am baptized with,

The baptism of John--was [it] from heaven or from men? Answer me!"