'Baptism' in the Bible

John went into all the district about the Jordan proclaiming a baptism of the penitent for the forgiveness of sins;

And all the people, including the tax-gatherers, when they listened to him upheld the righteousness of God, by being baptized with John's baptism.

But I have a baptism to undergo; and how am I pent up till it is accomplished!

"was John's baptism of Heavenly or of human origin?"