It is narrated from Hazrat Ka'b (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "When any of you feels pain in any part of his body, he should place his hand on the place of pain and say this seven times: «أَعُوذُ بِعِزَّةِ اللَّهِ وَقُدْرَتِهِ عَلَى كُلِّ شَيْءٍ مِنْ شَرِّ مَا أَجِدُ»."