Charles Ellicott Commentary 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." — Acts 12:15 (ASV)

It is his angel.—The language expresses the common belief of the Jews, that every true Israelite had a guardian angel specially assigned to him, who, when he appeared in human form, assumed the likeness of the man whom he protected. It is obvious that the record of the casual utterance of such a belief cannot be taken as an authoritative sanction of it.