حَدَّثَنَا مُحَمَّدُ بْنُ عِيسَى، حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ سَالِمِ بْنِ أَبِي الْجَعْدِ، عَنْ كُرَيْبٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ لَوْ أَنَّ أَحَدَكُمْ إِذَا أَرَادَ أَنْ يَأْتِيَ أَهْلَهُ قَالَ بِسْمِ اللَّهِ اللَّهُمَّ جَنِّبْنَا الشَّيْطَانَ وَجَنِّبِ الشَّيْطَانَ مَا رَزَقْتَنَا ثُمَّ قُدِّرَ أَنْ يَكُونَ بَيْنَهُمَا وَلَدٌ فِي ذَلِكَ لَمْ يَضُرَّهُ شَيْطَانٌ أَبَدًا ‏"‏ ‏.‏

Ibn ‘Abbas reported the Prophet (PBUH) as saying “If anyone who means to have intercourse with his wife says “In the name of Allaah, O Allaah, keep us away from the devil and keep the devil away from what You hast provided us.” It will be ordained that no devil will ever harm the child born to them. Translation Not Available

Book Ref: Sunan Abi Dawud Book 12 Hadith 2161
Web Ref:  Sunan Abi Dawud Book 11 Hadith 2156