Abdullah bin Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) said: "When any one of you has intercourse with his wife, what is there to prevent him from saying this supplication (i.e., he should recite this supplication at the time of intercourse) «بِسْمِ اللّٰهِ اَللّٰهُمَّ جَنِّبْنَا الشَّيْطَانَ وَجَنِّبِ الشَّيْطَانَ مَا رَزَقْتَنَا» 'In the name of Allah, O Allah, keep us away from Satan and keep Satan away from what You grant us (as a result of this intercourse).' After reciting this supplication, any child that is born to the couple from this intercourse will never be harmed by Satan."