Ali held that Jihad is the gateway to Paradise. He said: "God has opened this gate for His friend. It is the mantle of piety. It is the shield of faith. He who avoids it, God subjects him to disgrace".
Ali held that Jihad did not lie in merely taking up arms in the cause of God, it comprehends incessant struggle against falsehood in all spheres of life. Jihad is the main pillar on which Islam rests.
"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