AHMAD 4509:
from Ibn ʿUmar —
[Machine] The Prophet ﷺ saw some spittle in the direction of the mosque's qibla, so he stood up and wiped it away with his hand. Then, he faced the people and became angry at them, saying, "Indeed, Allah, the Almighty, looks at the face of one of you during his prayer, so none of you should spit in the direction of his face during prayer."
أحمد ٤٥٠٩:
عن ابن عمر —
أَنَّ النَّبِيَّ ﷺ رَأَى نُخَامَةً فِي قِبْلَةِ الْمَسْجِدِ فَقَامَ فَحَكَّهَا أَوْ قَالَ فَحَتَّهَا بِيَدِهِ ثُمَّ أَقْبَلَ عَلَى النَّاسِ فَتَغَيَّظَ عَلَيْهِمْ وَقَالَ إِنَّ اللهَ ﷻ قِبَلَ وَجْهِ أَحَدِكُمْ فِي صَلَاتِهِ فَلَا يَتَنَخَّمَنَّ أَحَدٌ مِنْكُمْ قِبَلَ وَجْهِهِ فِي صَلَاتِهِ
hadithunlocked.com