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My uncle asked Allah's Messenger (ﷺ) about a person who imagined to have passed wind during the prayer. Allah' Messenger replied: "He should not leave his prayers unless he hears sound or smells something."

My uncle said: The Prophet (ﷺ) said, "One should not leave his prayer unless he hears sound or smells something."

He should not return (from prayer) unless he hears a sound or perceives a smell (of passing wind). Abu Bakr and Zuhair b. Harb have pointed out in their narrations that it was 'Abdullah b. Zaid.

the Prophet (ﷺ) said: "Under every hair is sexual impurity so wash (all of) the hair and cleanse the skin."

"A man who felt something during Salah complained to the Prophet (ﷺ). He said: 'Do not stop praying unless you notice a smell or hear a sound.'"

"The Messenger of Allah said: 'Under every hair there is the state of sexual impurity, so wash the hair and cleanse the skin.'"