Sahih al-Bukhari 753

Arabic

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا لَيْثٌ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّهُ قَالَ رَأَى النَّبِيُّ صلى الله عليه وسلم نُخَامَةً فِي قِبْلَةِ الْمَسْجِدِ، وَهْوَ يُصَلِّي بَيْنَ يَدَىِ النَّاسِ، فَحَتَّهَا ثُمَّ قَالَ حِينَ انْصَرَفَ ‏ "‏ إِنَّ أَحَدَكُمْ إِذَا كَانَ فِي الصَّلاَةِ فَإِنَّ اللَّهَ قِبَلَ وَجْهِهِ، فَلاَ يَتَنَخَّمَنَّ أَحَدٌ قِبَلَ وَجْهِهِ فِي الصَّلاَةِ ‏"‏‏.‏ رَوَاهُ مُوسَى بْنُ عُقْبَةَ وَابْنُ أَبِي رَوَّادٍ عَنْ نَافِعٍ‏.‏

English translation

Narrated Ibn `Umar:The Prophet (ﷺ) saw expectoration in the direction of the Qibla of the mosque while he was leading the prayer, and scratched it off. After finishing the prayer, he said, "Whenever any of you is in prayer he should know that Allah is in front of him. So none should spit in front of him in the prayer

Reference: Sahih al-Bukhari 753, Book of Call to Prayers (Adhaan). English translation by Dr. Muhammad Muhsin Khan.