For they heard them speak with tongues, and magnify God. Then answered Peter,
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John Chrysostom
AD 407
While Peter yet spoke these words, the Holy Ghost fell on all them which heard the word. And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost. For they heard them speak with tongues, and magnify God.
Observe God's providential management. He does not suffer the speech to be finished, nor the baptism to take place upon a command of Peter, but, when He has made it evident how admirable their state of mind is, and a beginning is made of the work of teaching, and they have believed that assuredly baptism is the remission of sins, then immediately comes the Spirit upon them. Now this is done by God's so disposing it as to provide for Peter a mighty ground of justification. And it is not simply that the Spirit came upon them, but, they spoke with tongues: which was the thing that astonished those who had come together. They altogether disliked the matter, wherefore it is that the whole is of God; and as for Peter, it may almost be said, that he is present only to be taught (with them) the lesson, that they must take the Gentiles in hand, and that they themselves are the persons by whom this must be done. For whereas after all these great events, still both in Cæsarea and in Jerusalem a questioning is made about it, how would it have been if these (tokens) had not gone step by step with the progress of the affair? Therefore it is that this is carried to a sort of excess. Peter seizes his advantage, and see the plea he makes of it. Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as we?