On page 124 of Al-Manلqib, Al-Kha>يb al-Khwلrizmي al-\anafي has quoted a letter written by Mu`لwiya to `Amr b. al-`ء# in which he seeks to entice him to help him in the Battle of @iffيn. Then he refers to a letter written by `Amr in answer to Mu`لwiya. The two letters can be found in the biography of `Amr b. al-`ء#. In his letter, `Amr states:

“As for your accusing Abu’l \asan, the brother of the Messenger of Allلh and his testamentary trustee (wa#ي), of oppression and envy of `Uthmلn, and your calling his companions transgressors and alleging that he incited them to kill him – this is a lie and deviation from the right way. Woe be to you, O Mu`لwiya! Do you not know that Abu’l \asan sacrificed himself for the Messenger of Allلh, blessings and salutations of Allلh on him, and spent the night on his bed [when the Prophet was migrating in that night from Makka to Madina]? He was the possessor of precedence in Islلm and the Hijra; and the Messenger of Allلh, blessings and salutations of Allلh on him, had said of him:

‘He is from me and I am from him. His station in relation to me is that of Hلrْn’s (Aaron) in relation to Mْsل (Moses) except that there is no Prophet after me’.

And he said concerning him on the day of Ghadيr Khumm:

‘Surely, of whomsoever I am master (mawlل), `Alي is his master. O Allلh, befriend one who befriends him and be at enmity with one who shows enmity to him, and help one who helps him, and forsake one who forsakes him.’”