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ضَعْ يَدَكَ عَلَى الَّذِي تَألَّمَ مِنْ جَسَدِكَ وَقُلْ: بِسْمِ اللَّهِ, ثَلاَثاً, وَقُلْ سَبْعَ مَرَّاتٍ: أَعُوذُ بِاللَّهِ وَقُدْرَتِهِ مِنْ شَرِّ مَا أَجِدُ وَأُحَاذِرُ
(Place your hand at the site of the pain and say: (In the name of Allah(three times)) the supplicate seven times: (I take refuge in Allah and within His omnipotence from the evil that I feel and am wary of.))
Source: Muslim 4/1728.