حَدَّثَنِي مُحَمَّدُ بْنُ هِشَامٍ أَبُو عَبْدِ اللَّهِ، حَدَّثَنَا هُشَيْمٌ، عَنْ أَبِي بِشْرٍ، عَنْ مُجَاهِدٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى، عَنْ كَعْبِ بْنِ عُجْرَةَ، قَالَ كُنَّا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم بِالْحُدَيْبِيَةِ وَنَحْنُ مُحْرِمُونَ، وَقَدْ حَصَرَنَا الْمُشْرِكُونَ ـ قَالَ ـ وَكَانَتْ لِي وَفْرَةٌ فَجَعَلَتِ الْهَوَامُّ تَسَّاقَطُ عَلَى وَجْهِي، فَمَرَّ بِي النَّبِيُّ صلى الله عليه وسلم فَقَالَ ‏"‏ أَيُؤْذِيكَ هَوَامُّ رَأْسِكَ ‏"‏‏.‏ قُلْتُ نَعَمْ‏.‏ قَالَ وَأُنْزِلَتْ هَذِهِ الآيَةُ ‏ end actual hadith container 9‏

Narrated Ka`b bin Ujra: We were in the company of Allah's Messenger (PBUH) at Al-Hudaibiya in the state of Ihram and the pagans did not allow us to proceed (to the Ka`ba). I had thick hair and lice started falling on my face. The Prophet (PBUH) passed by me and said, "Are the lice of your head troubling you?" I replied, Yes." (The sub-narrator added, "Then the following Divine Verse was revealed:-- "And if anyone of you is ill or has an ailment in his scalp, (necessitating shaving) must pay a ransom (Fida) of either fasting or feeding the poor, Or offering a sacrifice." (2.196) Translation Not Available

Book Ref: Sahih Bukhari Book 64 Hadith 4191
Web Ref:  Sahih Bukhari Vol 5 Book 59 Hadith 504