Acts 12:15
"And they said unto her, Thou art mad. But she constantly affirmed that it was even so. Then said they, It is his angel."
Cross References (ranked by relevance)
Take heed that ye despise not one of these little ones; for I say unto you, That in heaven their angels do always behold the face of my Father which is in heaven.
And they, when they had heard that he was alive, and had been seen of her, believed not.
And as he thus spake for himself, Festus said with a loud voice, Paul, thou art beside thyself; much learning doth make thee mad.
Afterward he appeared unto the eleven as they sat at meat, and upbraided them with their unbelief and hardness of heart, because they believed not them which had seen him after he was risen.
And their words seemed to them as idle tales, and they believed them not.
The Angel which redeemed me from all evil, bless the lads; and let my name be named on them, and the name of my fathers Abraham and Isaac; and let them grow into a multitude in the midst of the earth.
If I had called, and he had answered me; yet would I not believe that he had hearkened unto my voice.