The treatment of a wound with the ashes of a mat
باب دَوَاءِ الْجُرْحِ بِإِحْرَاقِ الْحَصِيرِ
Sahih al-Bukhari, Book of Fighting for the Cause of Allah (Jihaad)(view book)
Sahih al-Bukhari 3037
Narrated Abu Hazim:
The people asked Sahl bin Sad As-Sa' idi "With what thing (medicine) was the wound of Allah's Apostle treated?" He replied, "There is none left (living) amongst the people who knows it better than. 'Ali used to bring water in his shield and Fatima (i.e. the Prophet's daughter) used to wash the blood off his face. Then a mat (of palm leaves) was burnt and its ash was inserted in the wound of Allah's Apostle."
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا أَبُو حَازِمٍ، قَالَ سَأَلُوا سَهْلَ بْنَ سَعْدٍ السَّاعِدِيَّ ـ رضى الله عنه ـ بِأَىِّ شَىْءٍ دُووِيَ جُرْحُ النَّبِيِّ ﷺ فَقَالَ مَا بَقِيَ مِنَ النَّاسِ أَحَدٌ أَعْلَمُ بِهِ مِنِّي، كَانَ عَلِيٌّ يَجِيءُ بِالْمَاءِ فِي تُرْسِهِ، وَكَانَتْ ـ يَعْنِي فَاطِمَةَ ـ تَغْسِلُ الدَّمَ عَنْ وَجْهِهِ، وَأُخِذَ حَصِيرٌ فَأُحْرِقَ، ثُمَّ حُشِيَ بِهِ جُرْحُ رَسُولِ اللَّهِ ﷺ.