Sayyiduna Ka'b bin 'Ujrah (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings of Allah be upon him) passed by me at Hudaybiyyah while I was lighting a fire under a pot, and lice were falling from my head. The Noble Prophet (peace and blessings of Allah be upon him) said: "O Ka'b! Are the lice causing you trouble?" I replied: Yes. The Noble Prophet (peace and blessings of Allah be upon him) said: "Shave your head and offer a sacrifice, or fast for three days, or feed six needy people one 'farq' of food. (This is equal to twelve mudd.)"