HOW TO MAKE SATAN VOMIT H 739 "The Prophet, praise and peace be upon him, sat with a man who was eating. He did not pronounce the Name of Allah until only a mouthful of the food was left. As he raised it to his mouth he said, 'In the Name of Allah, in its beginning and at its end.' The Prophet, praise and peace be upon him, smiled at this and said, 'satan ate with him, but when he pronounced the Name of Allah, satan vomited all he had eaten.'" R 739 Abu Daud and Nisai with a chain up to Umayyah, the son of Makhsi who related this.
731- وعن أُمَيَّةَ بن مَخْشِيٍّ الصحابيِّ رضي الله عنه ، قَالَ : كَانَ رسولُ الله صلى الله عليه وآله وسلم جَالِسَاً، وَرَجُلٌ يَأكُلُ، فَلَمْ يُسَمِّ اللهَ حَتَّى لَمْ يَبْقَ مِنْ طَعَامِهِ إِلاَّ لُقْمَةٌ ، فَلَمَّا رَفَعَهَا إِلَى فِيهِ ، قَالَ : بِسْمِ اللهِ أوَّلَهُ وَآخِرَهُ ، فَضَحِكَ النَّبيّ صلى الله عليه وآله وسلم ، ثُمَّ قَالَ : "مَا زَالَ الشَّيْطَانُ يَأكُلُ مَعَهُ ، فَلَمَّا ذَكَرَ اسمَ اللهِ اسْتَقَاءَ مَا فِي بَطْنِهِ" رواه أَبُو داود والنسائي .