Sahih al-Bukhari 4190
Sahih al-Bukhari · Book 64: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi) · The Ghazwa of Al-Hudaibiya
Narrated Ka`b bin Ujra:
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ ، عَنْ أَيُّوبَ ، عَنْ مُجَاهِدٍ ، عَنِ ابْنِ أَبِي لَيْلَى ، عَنْ كَعْبِ بْنِ عُجْرَةَ ـ رضى الله عنه ـ قَالَ أَتَى عَلَىَّ النَّبِيُّ صلى الله عليه وسلم زَمَنَ الْحُدَيْبِيَةِ، وَالْقَمْلُ يَتَنَاثَرُ عَلَى وَجْهِي فَقَالَ {أَيُؤْذِيكَ هَوَامُّ رَأْسِكَ}. قُلْتُ نَعَمْ. قَالَ " فَاحْلِقْ، وَصُمْ ثَلاَثَةَ أَيَّامٍ، أَوْ أَطْعِمْ سِتَّةَ مَسَاكِينَ، أَوِ انْسُكْ نَسِيكَةً " . قَالَ أَيُّوبُ لاَ أَدْرِي بِأَىِّ هَذَا بَدَأَ .
The Prophet (ﷺ) came to me at the time of Al-Hudaibiya Pledge while lice were falling on my face. He said, "Are the lice of your head troubling you?" I said, "Yes." He said, "Shave your head and fast for three days, or feed six poor persons, or slaughter a sheep as sacrifice." (The sub-narrator, Aiyub said, "I do not know with which of these three options he started.")