Volume 9, Book 93, Number 493:
Narrated Ibn ‘Abbas:
Allah’s Apostle said, “If anyone of you, when intending to have a sexual relation (sleep) with his
wife, says: Bismillah, Allahumma jannibna ashShaitan, wa Jannib ash-Shaitana ma razaqtana, Satan
would never harm that child, should it be ordained that they will have one. (Because of that sleep).”