Sahih al-Bukhari 5165
Sahih al-Bukhari · Book 67: Wedlock, Marriage (Nikaah) · What a man should say on having a sexual intercourse with his wife
Narrated Ibn `Abbas:
حَدَّثَنَا سَعْدُ بْنُ حَفْصٍ ، حَدَّثَنَا شَيْبَانُ ، عَنْ مَنْصُورٍ ، عَنْ سَالِمِ بْنِ أَبِي الْجَعْدِ ، عَنْ كُرَيْبٍ ، عَنِ ابْنِ عَبَّاسٍ ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " أَمَا لَوْ أَنَّ أَحَدَهُمْ يَقُولُ حِينَ يَأْتِي أَهْلَهُ بِاسْمِ اللَّهِ، اللَّهُمَّ جَنِّبْنِي الشَّيْطَانَ، وَجَنِّبِ الشَّيْطَانَ مَا رَزَقْتَنَا، ثُمَّ قُدِّرَ بَيْنَهُمَا فِي ذَلِكَ، أَوْ قُضِيَ وَلَدٌ، لَمْ يَضُرَّهُ شَيْطَانٌ أَبَدًا " .
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."