But Peter continued knocking,.... That they might come to him, and let him in; beginning to be impatient, and being very desirous of seeing his friends, as well as being in danger of being taken up, and had to prison again, should any of his enemies come by, who knew him:
and when they had opened the door, and saw him, they were astonished: they could hardly believe their own eyes; it was amazing to them, how it should be, that he should be delivered out of prison, when they knew there was such a strong guard about him.