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'Abdullah b. 'Abbas reported that while al-Fadl b. Abbas had been riding behind Allah's Messenger (may peace be upon him) a women of the tribe of Khath'am came to him (to the Holy Proppet) asking for a religious verdict. Fadl looked at her and she looked at him. Allah's Messenger (may peace be upon him) turned the face of al-Fadl to the other side. She said: Messenger of Allah, there is an obligation from Allah upon His servants in regard to Hajj. (But) my father is an aged man; he is incapable of riding safely. May I perform Hajj on his behalf? He said: Yes. It was during the Farewell Pilgrimage.