Acts 13:24
"When John had first preached before his coming the baptism of repentance to all the people of Israel."
Cross References (ranked by relevance)
Acts 1:22
Beginning from the baptism of John, unto that same day that he was taken up from us, must one be ordained to be a witness with us of his resurrection.
Acts 10:37
That word, I say, ye know, which was published throughout all Judaea, and began from Galilee, after the baptism which John preached;
Luke 1:76
And thou, child, shalt be called the prophet of the Highest: for thou shalt go before the face of the Lord to prepare his ways;