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It was narrated from Ibn 'Umar that the Messenger of Allah ﷺ saw some sputum on the Qiblah wall. He scrapped it off then he turned to the people and said:

"When any one of you is praying, let him not spit in front of him, for Allah is in front of him when he prays."
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم رَأَى بُصَاقًا فِي جِدَارِ الْقِبْلَةِ فَحَكَّهُ ثُمَّ أَقْبَلَ عَلَى النَّاسِ فَقَالَ ‏ "‏ إِذَا كَانَ أَحَدُكُمْ يُصَلِّي فَلاَ يَبْصُقَنَّ قِبَلَ وَجْهِهِ فَإِنَّ اللَّهَ عَزَّ وَجَلَّ قِبَلَ وَجْهِهِ إِذَا صَلَّى ‏"‏ ‏.‏

Classification

Sahih (Authentic)

References

• Sunan an-Nasa'i, 724
• Sunan an-Nasa'i, Vol. 1, Book of The Masjids, Hadith 725
• Sunan an-Nasa'i, Book of The Masjids, Hadith 725