Conversion to Islam
After the Hudaibiya Pact, 'Amr b Al 'Aas and Khalid b Walid came to Madina and were converted to Islam. On conversion, 'Amr b Al 'Aas wanted an assurance that his past sins had been forgiven, and the Holy Prophet gave him the necessary assurance. Thereafter he participated in all the battles fought under the Holy Prophet. In the apostasy wars under Abu Bakr, he undertook a campaign against the Kalb tribe. When Abu Bakr declared Jihad against the Byzantines, 'Amr offered his services and said, "I am one of the arrows of Allah, shoot me where you will."
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"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