The Prophet (ﷺ) said, "If anyone of you, when having sexual intercourse with his wife, says: Bismillah, Allahumma jannibni-Sh-Shaitan wa jannib-ish-Shaitan ma razaqtana, and if it is destined that they should have a child, then Satan will never be able to harm him."
Reference: Sahih al-Bukhari 5165 In-book : Book 67, Hadith 100 USC-MSA web (English) : Vol. 7, Book 62, Hadith 94 (deprecated)
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