Sahih Muslim Book - 39, Hadith - 5737

حَدَّثَنِي أَبُو الطَّاهِرِ ، وَحَرْمَلَةُ بْنُ يَحْيَى ، قَالاَ : أَخْبَرَنَا ابْنُ وَهْبٍ ، أَخْبَرَنِي يُونُسُ ، عَنِ ابْنِ شِهَابٍ ، أَخْبَرَنِي نَافِعُ بْنُ جُبَيْرِ بْنِ مُطْعِمٍ ، عَنْ عُثْمَانَ بْنِ أَبِي الْعَاصِ الثَّقَفِيِّ ، أَنَّهُ شَكَا إِلَى رَسُولِ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَجَعًا يَجِدُهُ فِي جَسَدِهِ مُنْذُ أَسْلَمَ فَقَالَ لَهُ رَسُولُ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : ضَعْ يَدَكَ عَلَى الَّذِي تَأَلَّمَ مِنْ جَسَدِكَ ، وَقُلْ بِاسْمِ اللهِ ثَلاَثًا ، وَقُلْ سَبْعَ مَرَّاتٍ أَعُوذُ بِاللَّهِ وَقُدْرَتِهِ مِنْ شَرِّ مَا أَجِدُ وَأُحَاذِرُ.

It was narrated from ‘Uthman bin Abdul-As Ath-Thaqafi that he complained to the Messenger of Allah (s.a.w) about some pain that he had felt in his body since he became Muslim. The Messenger of Allah (s.a.w) said to him: “Put your hand on the part of your body that hurts and say: ‘Bismillah (in the Name of Allah)’ three times, then say seven times: ‘I seek refuge in Allah and His Power from the evil of what I find and I fear.’’