Sunan Abi Dawud Book 2, Hadith 85

The Messenger of Allah (ﷺ) said: Spitting in the mosque is a sin and it is expiated by burying the spittle.

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Spitting in the mosque is a sin and it is expiated by burying the spittle.

Sunan Abi Dawud Book 2, Hadith 84
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The Messenger of Allah(ﷺ) said: Spitting phlegm in the mosque... The narrator then transmitted the rest of the tradition to the same effect.

Sunan Abi Dawud Book 2, Hadith 86