Uthman bin Abu As reported,

He complained to the Messenger of Allah ﷺ about a pain he had been feeling in his body ever since he became Muslim. The Messenger of Allah ﷺ said to him, "Place your hand on the part of your body that hurts and say '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 what I fear.'"

عن عثمان بن أبي العاص الثقفي

أنه شكا إلى رسول الله ﷺ وجعا يجده في جسده منذ أسلم، فقال له رسول الله ﷺ: ضع يدك على الذي تألم من جسدك، وقل: باسم الله ثلاثا، وقل سبع مرات: أعوذ بالله وقدرته من شر ما أجد وأحاذر.