Patristics

“Now, those who were baptized in the baptism of John, by whom Christ was Himself baptized, were not regenerated; but they were prepared through the ministry of His forerunner, who cried, 'Prepare ye the way of the Lord,' for Him in whom only they could be regenerated. For His baptism is not with water only, as was that of John, but with the Holy Spirit also;....” Augustine, Enchiridion, XLIX, NPNF1, 3:253