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Bukhari :: Book 3 :: Volume 34 :: Hadith 272

Narrated 'Abbas bin Tamim:

that his uncle said: "The Prophet was asked: If a person feels something during his prayer; should one interrupt his prayer?" The Prophet said: No! You should not give it up unless you hear a sound or smell something." Narrated Ibn Abi Hafsa: Az-Zuhri said, "There is no need of repeating ablution unless you detect a smell or hear a sound."