John Chrysostom
The apostles are again exposed to dangers and again receive help from God. Hear how this happened: "But the angel of the Lord opened the prison doors by night, and brought them out, and said, 'Go, stand in the temple and speak to the people all the words of this life.'"
This took place both for the apostles' consolation and for the benefit and instruction of the Jews. Observe that what happened in Christ's time happens now also.
He certainly does not permit them to see the actual performance of the miracles. Yet He sets before them what could assure them. For example, at His Resurrection He did not allow them to see how He rose.
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They were unworthy to see the Resurrection, but He shows it by His works. Likewise, when the water was changed into wine, those reclining at table did not see it because they were overcome by wine. He leaves judgment about it to others.
So it is here also. They do not see how the apostles were led out. But they did see the proofs by which they could be assured of what had happened.
Why did the angel lead them out at night? Because in that case they could be believed more than otherwise. In another case they would not even have questioned them about it, and they themselves would not have believed.
So it was also in ancient times, for example with Nebuchadnezzar. He saw the youths in the furnace praising God, and then he was amazed (Dan 3:91).
Therefore the Sadducees ought first to have asked the apostles, "How did you come out?" But as though nothing had happened, they address the apostles with this question: "Did we not strictly command you not to teach in this name?" (Acts 5:28).
"Having brought them out": the angel does not lead them away himself, but releases them. From this their fearlessness is also revealed, for they themselves went into the temple at night and taught.
If the guards had released them, as the rulers supposed, then, if they had agreed to go out, they would have fled. If the guards had driven them out, they would not have appeared in the temple, but would have withdrawn.
This is clear to every sound-minded person.