حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم رَأَى بُصَاقًا فِي جِدَارِ الْقِبْلَةِ فَحَكَّهُ ثُمَّ أَقْبَلَ عَلَى النَّاسِ فَقَالَ " إِذَا كَانَ أَحَدُكُمْ يُصَلِّي فَلاَ يَبْصُقْ قِبَلَ وَجْهِهِ فَإِنَّ اللَّهَ تَبَارَكَ وَتَعَالَى قِبَلَ وَجْهِهِ إِذَا صَلَّى " .
Yahya related to me from Malik from Nafi from Abdullah ibn Umarthat the Messenger of Allah, may Allah bless him and grant him peace,saw spittle on the wall of the qibla and scraped it off. Then he wentup to the people and said, "Do not spit in front of you when you arepraying, because Allah, the Blessed and Exalted, is in front of youwhen you pray." Translation Not Available
Book Ref: Muwatta Imam Malik Book 14 Hadith 461
Web Ref: Muwatta Imam Malik Book 14 Hadith 4