'Baptism' in the Bible

beginning from the baptism of John, unto the day that he was received up from us, of these must one become a witness with us of his resurrection.

that saying ye yourselves know, which was published throughout all Judaea, beginning from Galilee, after the baptism which John preached;

when John had first preached before his coming the baptism of repentance to all the people of Israel.

This man had been instructed in the way of the Lord; and being fervent in spirit, he spake and taught accurately the things concerning Jesus, knowing only the baptism of John:

And he said, Into what then were ye baptized? And they said, Into John's baptism.

And Paul said, John baptized with the baptism of repentance, saying unto the people that they should believe on him that should come after him, that is, on Jesus.