Prayer (Kitab Al-Salat)
2/26. Chapter:
Spitting In A Masjid Is Disliked
Sunan Abi Dawud
حَدَّثَنَا أَبُو كَامِلٍ، حَدَّثَنَا يَزِيدُ، - يَعْنِي ابْنَ زُرَيْعٍ - عَنْ سَعِيدٍ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " النُّخَاعَةُ فِي الْمَسْجِدِ " . فَذَكَرَ مِثْلَهُ .
Anas b. Malik reported: The Messenger of Allah(ﷺ) said: Spitting phlegm in the mosque... The narrator then transmitted the rest of the tradition to the same effect.
Reference : Sunan Abi Dawud 476In-book reference : Book 2, Hadith 86English translation : Book 2, Hadith 476