John Chrysostom

They, then, stand up for the Law, and say, "He blasphemeth against Moses:" he shows, therefore, that it is they who blaspheme, and that (their blasphemy is not only against Moses, but) against God; shows that "they" from the very beginning have been doing this: that "they" have themselves destroyed their "customs," that there is no need of these: that while accusing him, and saying that he opposed Moses, they themselves were opposing the Spirit: and not merely opposing, but with murder added to it: and that they had their enmity all …

Homily on Acts 17 ↗

Theophylact of Ohrid

For he says: "You have now become betrayers and murderers… you who received the law through the ministry of Angels and did not keep it," that is, arranged by Angels and delivered by the One who appeared in the bush. He shows that they did not obey and do not obey either God, or Angels, or prophets, or the Spirit.

Commentary on Acts ↗

Oecumenius

For this is, "certain of you have received the law as commands of angels." And some also say this, that the one who was ordered by angels and entrusted through an angel to Moses, the one who appeared to him in the bush. "As regulations," instead of "according to the commands," just as those gave orders to Moses, having appeared in the bush and on the mountain. [CHRYSOSTOM]

Commentary on Acts ↗

Bede

You who received the law as ordained by angels. The law is indeed ordained by angels, in the hand of a mediator.

Commentary on Acts ↗