Albert Barnes on Acts 7:35

When they refused. That is, when he first presented himself to them, Ex 2:13,14. Stephen introduces and dwells upon this refusal in order, perhaps, to remind them that this had been the character of their nation; and to prepare the way for the charge which he intended to bring against those whom he addressed, as being stiff-necked and rebellious. See Acts 7:51,52, etc.

A ruler. A military leader, or a governor in civil matters.

A deliverer. A Redeemer--λυτρωτην--. It properly means one who redeems a captive or a prisoner by paying a price or ransom. And it is applied thus to our Lord Jesus, as having redeemed or purchased sinners by his blood as a price, Tit 2:14, 1Pet 1:18, Heb 9:12. It is used here, however, in a more general sense to denote the deliverance, without specifying the manner. Comp. Ex 6:6; Lk 24:21, 1:68, 2:38.

By the hand of the angel. Under the direction and by the help of the angel, Nu 20:16. Acts 7:30.

(c) "the angel" Ex 14:19, Nu 20:16