'Baptism' in the Bible

And he came into all the country about Jordan, preaching the baptism of repentance for the remission of sins;

So he said to the people who went out to him for baptism: You offspring of snakes, at whose word are you going in flight from the wrath to come?

Then tax-farmers came to him for baptism and said to him, Master, what have we to do?

John made answer, saying to them all, Truly, I give you baptism with water, but one is coming who is greater than I, whose shoes I am not good enough to undo: he will give you baptism with the Holy Spirit, and with fire:

Now it came about that when all the people had been given baptism, Jesus, having had baptism with them, was in prayer, when, the heaven being open,

And all the people that heard him, and the publicans, justified God, being baptized with the baptism of John.

But the Pharisees and the teachers of the law were against the purpose of God for themselves, not having had his baptism.)

But I have a baptism to be baptized with; and how am I straitened till it be accomplished!

The baptism of John, was it from heaven, or of men?