And Abu Bakr ibn Abi Shaybah narrated to us, Abdullah ibn Numayr narrated to us, from Zakariyya ibn Abi Za'idah, Abd al-Rahman ibn al-Asbahani narrated to us, Abdullah ibn Ma'qil narrated to me, Ka'b ibn 'Ujrah — may Allah be pleased with him — narrated to me that he went out with the Prophet, peace and blessings be upon him, in a state of ihram, and his head and beard became infested with lice. When that reached the Prophet, peace and blessings be upon him, he sent for him, summoned the barber, and had his head shaved. Then he said to him: "Do you have a sacrificial animal?" He said: "I cannot afford it." So he commanded him to fast three days or to feed six poor persons, giving two sa' to each poor person. Then Allah, Glorified and Exalted, revealed concerning him specifically: "And whoever among you is ill or has an ailment of the head" — and thereafter it became general for the Muslims.