Chapter: It is permissible for a Muhrim to shave his head if there is a problem, but it is obligatory to offer a Fidyah for shaving it, and Clarifying what the Fidyah is
Authentic
hadith of Sahih Muslim
Sahih Muslim 1201c
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.
‘Abdullāh ibn Ma‘qil reported: I sat with Ka‘b ibn ‘Ujrah and asked him about the ransom and he replied: "It (the verse) was revealed concerning my case specifically, but it is also meant for you in general. I was carried to the Messenger of Allah (may Allah's peace and blessings be upon him) and…