Their glory being in their fathers, St. Stephen reminds them that many of them rebelled against God and his servant Moses; as they (their posterity) now were rebellions against Christ, who came to save them, as Moses before had done; but from a greater bondage, and by more valuable means. In their hearts turned back again into Egypt; not so much towards that country, or food they had there, (garlick and onions), as towards their idolatry and superstition; as in the following verse appears.
Related Commentaries of Acts 7:39
Acts 7:39
39 To whom our fathers would not obey, but thrust him from them, and in their hearts turned back again into Egypt,