After that he had showed wonders and signs: God could with the least word or motion of his will save his people; but he chooseth so to do his wonderful works, that they may be had in remembrance. In the Red sea; it is not agreed why it is so called; but this name of that sea is mentioned in profane authors. This whole verse, as divers others, refer to the history of it in Exodus, from Exodus 1:1-14:31.
Related Commentaries of Acts 7:36
Acts 7:36
36 He brought them out, after that he had shewed wonders and signs in the land of Egypt, and in the Red sea, and in the wilderness forty years.