572Jamiat TirmidhiSahih (Darussalam)حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم الْبُزَاقُ فِي الْمَسْجِدِ خَطِيئَةٌ وَكَفَّارَتُهَا دَفْنُهَا " قَالَ أَبُو عِيسَى وَهَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ Anas bin Malik narrated that :the Messenger of Allah said: "To spit in the Masjid is a sin, and burying it is its atonement."Reference: Jami` at-Tirmidhi 572 In-book : Book 6, Hadith 29 English translation : Vol. 2, Book 1, Hadith 572