Acts 19:3
"And he said unto them, Unto what then were ye baptized? And they said, Unto John’s baptism."
Cross References (ranked by relevance)
Acts 18:25
This man was instructed in the way of the Lord; and being fervent in the spirit, he spake and taught diligently the things of the Lord, knowing only the baptism of John.
Matthew 28:19
Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
1 Corinthians 12:13
For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.
Acts 8:16
(For as yet he was fallen upon none of them: only they were baptized in the name of the Lord Jesus.)