Sahih al-Bukhari 836

No cleaning (rubbing) one's forehead and nose till one has completed As-Salat (the prayer)

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حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ قَالَ حَدَّثَنَا هِشَامٌ عَنْ يَحْيَى عَنْ أَبِي سَلَمَةَ قَالَ سَأَلْتُ أَبَا سَعِيدٍ الْخُدْرِيَّ فَقَالَ

رَأَيْتُ رَسُولَ اللَّهِ ﷺ يَسْجُدُ فِي الْمَاءِ وَالطِّينِ حَتَّى رَأَيْتُ أَثَرَ الطِّينِ فِي جَبْهَتِهِ

Translation

Chain of narrators

I saw Messenger of Allah ﷺ prostrating in mud and water and saw the mark of mud on his forehead.

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al-Bukhari	Sound	hadithunlocked