Acts 16:33 - Ellicott's Commentary On The Whole Bible

He... washed their stripes; and was baptized... — The two-fold washings, that which testified of the repentance of the gaoler and his kindly reverence for his prisoners, and that which they administered to him as the washing of regeneration, are placed in suggestive juxtaposition. He, too, was cleansed from wounds which were worse than those inflicted by the rods of the Roman lictors. No certain answer can be given to the question whether the baptism was by immersion or affusion. A public prison was likely enough to contain a bath or pool of some kind, where the former would be feasible. What has been said above (see Note on Acts 16:15) as to the bearing of these narratives on the question of infant baptism applies here also, with the additional fact that those who are said to have been baptised are obviously identical with those whom St. Paul addressed (the word “all” is used in each case), and must, therefore, have been of an age to receive instruction together with the gaoler himself.