'Baptism' in the Bible

John came baptizing in the wilderness and preaching the baptism of repentance for forgiveness of sins.

But Jesus said to them, "You don't know what you are asking. Are you able to drink the cup that I drink, and to be baptized with the baptism that I am baptized with?"

They said to him, "We are able." Jesus said to them, "You shall indeed drink the cup that I drink, and you shall be baptized with the baptism that I am baptized with;

The baptism of John -- was it from heaven, or from men? Answer me."