Cain's Disobedience
The time arrived when the two young men desired life partners. This was part of Allah's plan for mankind, to multiply and form nations with different cultures and colors. Allah revealed to Adam that he should marry each son to the twin sister of the other. Adam instructed his children according to Allah's command, but Cain was displeased with the partner chosen for him, for Abel's twin-sister was not as beautiful as his own.
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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