A man of faith and piety is always subject to the following fears: the fear of God, lest by any disobedience there is any faltering in faith; the fear of the angels lest they may record anything against you which may be a cause of remorse for you on the day of resurrection; the fear of the Satan lest he may tempt you to any evil. the fear of the angel of death, lest your life is taken before you have sought pardon for you sins; the fear of the world, lest by its temptation it makes you oblivious of the next world; and the fear of the family members lest by your attachment to them you become oblivious to your duty to 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