Hadith 3984
Sayyiduna Ka'b bin 'Ujrah (may Allah be pleased with him) narrates: On the occasion of the Treaty of Hudaybiyyah, the Noble Prophet (peace and blessings be upon him) came to me; my hair was very long. The Noble Prophet (peace and blessings be upon him) asked: Are the lice of your head troubling you? I replied: Yes. The Noble Prophet (peace and blessings be upon him) said: Then shave it and offer a sacrifice of a goat, or fast for three days, or give three sa' of dates in charity to six needy people.