'Baptism' in the Bible

John the Baptist appeared in the wilderness preaching a baptism of repentance for the forgiveness of sins [that is, requiring a change of one’s old way of thinking, turning away from sin and seeking God and His righteousness].

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 [of suffering and death] with which I am baptized?”

And they replied to Him, “We are able.” Jesus told them, “The cup that I drink you will drink, and you will be baptized with the baptism with which I am baptized.

Was the baptism of John [the Baptist] from heaven [that is, ordained by God] or from men? Answer Me.”