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Ahlul Bayt Digital Islamic Library Project: The Last Will of Ali Ibn Abi Talib
Here is the will of Ali ibn Abi Talib, which he gave to his two sons, "after the attempt on his life by a stab from Ibn Muljam" in which he advises his sons "to be conscious of Allah" and follow the teachings of the Koran.
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Al islam.org: Sayings of Imam Ali Ibn Abi Talib
Here are the famous "sayings of Imam Ali," the fourth Caliph of Islam.