(10) باب جَوَازِ حَلْقِ الرَّأْسِ لِلْمُحْرِمِ إِذَا كَانَ بِهِ أَذًى وَوُجُوبِ الْفِدْيَةِ لِحَلْقِهِ وَبَيَانِ قَدْرِهَا
Kalb b. Ujra (Allah be pleased with him) reported:
It was I for whom this verse was revealed (to the Holy Prophet):" Whoever among you is sick or has an ail- ment of the head, he (may effect) a compensation by lasting or alms or a sacrifice" He said: I came to him (the Holy Prophet) and he said: Come Dear. So I went near. He (again) said: Come near. So I went near. Thereupon the Messenger of Allah (ﷺ) said: Do the vermins trouble you? Ibn Aun (one of the narrators) said: I think he (Ka'b b. Ujra) replied in the affirmative. He (the Holy Prophet) then commanded to do compensation by fasting or by giving sadaqa (feeding six needy persons) or by sacrifice (of a animal) that is available.
Reference: Sahih Muslim 1201 c
In-book reference: Book 15, Hadith 89
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 2734