Luke
Acts 12:5ESV·traditional attribution

So Peter was kept in prison, but earnest prayer for him was made to God by the church.

John Calvin Reformed @genevareformer

5. But prayers were made. Luke teacheth here that the faithful did not, in the mean season, foreslow [neglect] their duty, Peter stood in the forward “In prima acie,” in the front rank, the van. alone; but all the rest fought with their prayers together with him, and they aided him so much as they were able.

Matthew Henry Presbyterian @wholebiblehenry

We have here an account of Peter's deliverance out of prison, by which the design of Herod against him was defeated, and his life preserved for further service, and a stop given to this bloody torrent. Now, I. One thing that magnified his deliverance was that it was a signal answer to prayer (Act 12:5): Peter was kept in prison with a great deal of...

Commenting on Acts 12:5-19

John Gill Reformed Baptist @doctorgill

Peter therefore was kept in prison,.... Till the feast of the passover was at an end: but prayer was made without ceasing of the church unto God for him; this was not done by them as a body together, but either by them in several bands at different places, or by some of the principal of the church at some one certain place, and where...