Marcos 1

Marcos 1:25

He put a bridle in the mouths of the demons that cried after him from the tombs. For although what they said was true, and they did not lie when they said, "You are the Son of God" and "the Holy One of God," yet he did not wish that the truth should proceed from an unclean mouth, and especially from such as those who under pretense of truth might mingle with it their own malicious devices. — TO THE BISHOPS OF EGYPT 1.3