Expositor's Bible Commentary Commentary Acts 1:5

"For John indeed baptized with water; but ye shall be baptized in the Holy Spirit not many days hence." — Acts 1:5 (ASV)

The statement appears to come from Mk 1:8 , where it is part of the message of John the Baptist. One could take v.5 as an explanatory comment on Luke’s part, but its parallel in Ac 11:16, where it is given as the word of the Lord Jesus, suggests that here too it should be understood as being attributed to Jesus.