Luke
Acts 12:21BSB·traditional attribution

On the appointed day, Herod donned his royal robes, sat on his throne, and addressed the people.

John Calvin Reformed @genevareformer

21. Upon an appointed day. Luke saith that the men of Tyrus and Sidon had peace granted them, because this was the occasion of the king’s oration, without doubt, that he might make them his underlings hereafter. The same history is extant in Josephus, in his Nineteenth Book of Antiquities, save only that he calleth him everywhere Agrippa, whom Luke calleth Herod.

Matthew Henry Presbyterian @wholebiblehenry

In these verses we have, I. The death of Herod. God reckoned with him, not only for his putting James to death, but for his design and endeavour to put Peter to death; for sinners will be called to an account, not only for the wickedness of their deeds, but for the wickedness of their endeavours (Psa 28:4), for the mischief they have done and...

Commenting on Acts 12:20-25

John Gill Reformed Baptist @doctorgill

And upon a set day,.... Either on some feast day of divine appointment, as a feast day was by the Jews called "a stated day"; or on some day appointed by Herod, for the receiving of the ambassadors of Tyre and Sidon, and of hearing their petitions; or as Josephus (r) says, it was on the second day of the sports and plays, instituted by...