عَنْ سَعْدِ بْنِ أَبِي وَقَّاصٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَقُولُ: ((إِذَا تَنَخَّمَ أَحَدُكُمْ فِي الْمَسْجِدِ فَلْيُغَيِّبْ نُخَامَتَهُ أَنْ تُصِيبَ جِلْدَ مُؤْمِنٍ أَوْ ثَوْبَهُ فَتُؤْذِيَهُ))
Sayyiduna Sa’d bin Abi Waqqas (may Allah be pleased with him) narrates that I heard the Messenger of Allah (peace and blessings be upon him) say: When any of you spits or clears his throat in the mosque, he should conceal it, lest it may fall on the body or clothes of a believer and cause him harm.