وَعَنْ كَعْبِ بْنِ عُجْرَةَ رَضِيَ اللَّهُ عَنْهُ
أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَرَّ بِهِ وَهُوَ بِالْحُدَيْبِيَةَ قَبْلَ أَنْ يَدْخُلَ مَكَّةَ وَهُوَ مُحْرِمٌ وَهُوَ يُوقِدُ تَحْتَ قِدْرٍ وَالْقَمْلُ تهافت عَلَى وَجْهِهِ فَقَالَ: «أَتُؤْذِيكَ هَوَامُّكَ؟». قَالَ: نَعَمْ. قَالَ: «فَاحْلِقْ رَأْسَكَ وَأَطْعِمْ فَرَقًا بَيْنَ سِتَّةِ مَسَاكِينَ». وَالْفَرَقُ: ثَلَاثَةُ آصُعٍ: «أَوْ صُمْ ثَلَاثَةَ أَيَّام أوانسك نسيكة»
Kab ibn ‘Ujra told that the Prophet (sallallahu alayhi wa sallam) came upon him at al-Hudaibiya while he was still in the sacred state before entering Mecca. He was kindling a fire under a pot and lice were falling in large numbers over his face. He asked him whether the insects were annoying him, and when he replied that they were, he said, ‘Shave your head, and give a faraq (i.e. three sa’s) to six poor people, or fast three days, or sacrifice an animal.’ Bukhari and Muslim.’