Sayyidina Ka’b ibn Ujrah (RA) reported that the Prophet (SAW) passed by him in Hudaybiyah before enterring Makkah while he was a muhrim, kindling a fire un a vessel and lice infested his face. He (the Prophet) asked him, ‘Do they trouble you?” He said, “Yes.” So, the Prophet said, “Shave your head and feed a faraq to six poor people-and a faraq is three sa-or fast three days, or sacrifice an animal.” The version of lbn Nujayh has, “or sacrifice a goat.”
[Bukhari 921, Muslim 80]