Almighty Allah declared: Those (i.e., believers) unto whom the people (hypocrites) said: "Verily, the people (pagans) have gathered against you (a great army), therefore, fear them." But it (only) increased them in Faith, and they said: 'Allah (Alone) is Sufficient for us, and He is the Best Disposer of affairs (for us)."
So they returned with Grace and Bounty from Allah. No harm touched them; and they followed the good Pleasure of Allah. And Allah is the Owner of Great Bounty. It is only Satan that suggests to you the fear of his Auliya supporters and friends (polytheists, disbelievers in the Oneness of Allah and in His Messenger Muhammad), so fear them not, but fear Me, if you are (true) believers." Surah 3: 173-175
Related Quran Ayaaths of this Hadith.
Surah 6 : Ayah 83 Surah 4 : Ayah 163 Surah 14 : Ayah 35 Surah 60 : Ayah 4 Surah 21 : Ayah 51 Surah 21 : Ayah 52 Surah 3 : Ayah 65"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