Chapter: No cleaning (rubbing) one's forehead and nose till one has completed As-Salat (the prayer)
Narrated Abu Sa`id Al-Khudri:I saw Allah's Messenger (ﷺ) prostrating in mud and water and saw the mark of mud on his forehead.
Reference
Sahih al-Bukhari 836
In-book reference
Book 10, Hadith 229
USC-MSA web (English)
Vol. 1, Book 12, Hadith 798
Translation by Dr. M. Muhsin Khan · Language: EN
Sahih
Arabic Text
حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا هِشَامٌ، عَنْ يَحْيَى، عَنْ أَبِي سَلَمَةَ، قَالَ سَأَلْتُ أَبَا سَعِيدٍ الْخُدْرِيَّ فَقَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَسْجُدُ فِي الْمَاءِ وَالطِّينِ حَتَّى رَأَيْتُ أَثَرَ الطِّينِ فِي جَبْهَتِهِ.