'Baptism' in the Bible

He came into all the region around the Jordan, preaching the baptism of repentance for remission of sins.

When all the people and the tax collectors heard this, they declared God to be just, having been baptized with John's baptism.

But I have a baptism to be baptized with, and how distressed I am until it is accomplished!

the baptism of John, was it from heaven, or from men?"