Prayers (Salat)
8/37. Chapter:
The expiation for spitting in the mosque
Sahih Bukhari
حَدَّثَنَا آدَمُ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ حَدَّثَنَا قَتَادَةُ، قَالَ سَمِعْتُ أَنَسَ بْنَ مَالِكٍ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " الْبُزَاقُ فِي الْمَسْجِدِ خَطِيئَةٌ، وَكَفَّارَتُهَا دَفْنُهَا ".
Narrated Anas bin Malik: The Prophet (ﷺ) said, "Spitting in the mosque is a sin and its expiation is to bury it."
Reference : Sahih al-Bukhari 415In-book reference : Book 8, Hadith 65USC-MSA web (English) reference : Vol. 1, Book 8, Hadith 407