On the departure of Urwa, the Holy Prophet sent Khirash b Umayyah as an emissary to the Quraish. When he arrived in Makkah he was mar-treated by the Quraish, and the camel on which he rode was hamstrung. In turn the Quraish sent a detachment with the object of killing the Holy Prophet, and some of the prominent Muslims. These persons were taken captive by the Muslims. The companions wanted to kill them, but the Holy Prophet forbade the shedding of blood within the precincts of the sacred territory.
"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