Luke
Acts 4:8BSB·traditional attribution

Then Peter, filled with the Holy Spirit, said to them, “Rulers and elders of the people!

John Calvin Reformed @genevareformer

8. Peter, being filled with the Holy Ghost It is not without great cause that Luke addeth this, to the end we may know that Peter spake not with such a majesty of himself. And surely, seeing he had denied his Master, Christ, being afraid at the voice of a silly woman, (Matthew 26:70,) he should have utterly fainted in such an assembly, when he...

Matthew Henry Presbyterian @wholebiblehenry

We have here the trial of Peter and John before the judges of the ecclesiastical court, for preaching a sermon concerning Jesus Christ, and working a miracle in his name. This is charged upon them as a crime, which was the best service they could do to God or men. I. Here is the court set. An extraordinary court, it should seem, was called on purpose upon this occasion.

Commenting on Acts 4:5-14

John Gill Reformed Baptist @doctorgill

Then Peter, filled with the Holy Ghost,.... At that very instant, having received a fresh measure of the gifts and graces of the Spirit, besides what he had poured forth upon him at the day of Pentecost; so that he had great courage and presence of mind, and freedom of speech, as Christ had promised his disciples they should have, when they were brought before governors and magistrates, Mat 10:18.