Uthman said: When the Muslims are disunited they would falter in their faith, and would be bereft of their inherent strength O people, if I give you all the world, that would not suffice as the price for your faith. You will not be conscious of the reality of faith till love for God is held dearer than the passion to acquire wealth. The highest degree in faith is that you always regard yourself in the presence of 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