Sahih Muslim | Book 35 | Hadith Number 6542
Narrated by Khaula bint Hakim Sulamiyya
Khaula bint Hakim Sulamiyya reported: I heard Allah's Messenger (may peace be upon him) as saying: When any one of you stays at a place, he should say: "I seek refuge in the Perfect Word of Allah from the evil of that He created." Nothing would then do him any harm until he moves from that place. Abu Huraira reported that a person came to Allah's Messenger (may peace be upon him) and said: "Allah's Messenger, I was stung by a scorpion during the night. Thereupon he said: Had you recited these words in the evening: "I seek refuge in the Perfect Word of Allah from the evil of what He created," it would not have done any harm to you.