But when the Jews saw the multitudes, they were filled with envy, and spake against those things which were spoken by Paul, contradicting and blaspheming. The Jews - were filled with envy - See on Acts 5:17 (note). These could not bear the Gentiles, who believed in Christ, to be equal with them; and yet; according to the Gospel, it was really the case.
Contradicting - The arguments and statements brought forward by the disciples; and blaspheming, speaking impiously and injuriously of Jesus Christ. This is probably what is meant.