Acts 8:37 - Ellicott's Commentary On The Whole Bible

And Philip said.... — The verse is a striking illustration of the tendency which showed itself at a very early period to improve the text of Scripture with a view to greater edification. It existed in the time of Irenæus, who quotes it (3:12), but is wanting in all the best MSS., including the Sinaitic, and many versions. The motive for the interpolation lies on the surface. The abruptness of the unanswered question, and the absence of the confession of faith which was required in the Church’s practice on the baptism of every convert, seemed likely to be stumbling-blocks, and the narrative was completed according to the received type of the prevailing order for baptism. Even with the insertion, the shortness of the confession points to a very early stage of liturgical development, as also does the reference to it in Irenæus.