After the Battle of Siffin, Ali wrote a detailed testament in favor of his son Imam Hasan. It is a brilliant code of counsel, which provides guidance for every Muslim. The testament is found in Nahj-ul-Balagha, and its running translation is given hereunder: "Son, I enjoin on you that you should fear God. Follow His commandments. Enliven your heart with His remembrance. Hold fast to His rope. No relationship is stronger than the relation that exists between you and God."
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari