John Chrysostom

See again these in perplexity, these in pain: but those in quiet and cheerfulness and delight. It is not merely, They were grieved, but "They were cut" to the heart. Truly this makes good that proverb, "Evil do, evil fare:" as we may see in this case. Here were these men in bonds, set at the bar of judgment, and the men that sit in judgment upon them were in distress and helpless perplexity. For as he who strikes a blow upon the adamant, gets the shock of the blow himself, so it was with these men. …

Homily on Acts 13 ↗

Theophylact of Ohrid

Others, listening to the apostles, were troubled, while the high priest and those with him "were cut to the heart and plotted to kill them."

Commentary on Acts ↗

Oecumenius

That he grants forgiveness, and we bear witness, and the Holy Spirit, which would not have come, if first the sins had not been loosened. Humility, moreover, is the nature of such a discourse. For it has not been said to us as a privilege entirely for those who love him, but to the One who imparts it, it has been given in common to all who submit to Him. Therefore, even if they themselves were persuaded, they would not be without a share of his gift, through the lawlessness caused by the cross.

Commentary on Acts ↗