Acts 12:15

And they said unto her, Thou art mad. But she confidently affirmed that it was even so. And they said, It is his angel.

For reasons underlying the surprise of the church that their prayers had been answered, see under Acts 12:5.

It is his angel ... This verse proves that in the apostolic church the Christians believed that every person has a guardian angel; but it is uncertain what deductions should be made from this fact. Jesus apparently justified such a view by his reference to the angels of little children in Matthew 18:10, as being angels of the highest rank. See in my Commentary on Matthew, under Matthew 18:10, and in my Commentary on Hebrews, Hebrews 1:14. The thinking of those who said this seems to be that "Since Herod has already killed Peter, it must be his personal angel who is knocking at the gate."

Peter kept on knocking, however; and the stunned hearers finally let him in.