A.T. Robertson Commentary Acts 7:53

"ye who received the law as it was ordained by angels, and kept it not." — Acts 7:53 (ASV)

Ye who (οιτινες). The very ones who, quippe qui, often in Acts when the persons are enlarged upon (8:15; 9:35; 10:41,47).

As it was ordained by angels (εις διαταγας αγγελων). About angels see on 7:38. Διαταγη (from διατασσω, to arrange, appoint) occurs in late Greek, LXX, inscriptions, papyri, Deissmann, Light from the Ancient East, pp. 89ff., and in N.T. only here and Ro 13:2. At (or as) the appointment of angels (cf. Matthew 10:41; 12:41 for this use of εις).

And kept it not (κα ουκ εφυλαξατε). Like a whipcracker these words cut to the quick. They gloried in possessing the law and openly violated it (Romans 2:23).