Habeel and Kabeel (Cain and Abel) make the first example of a dispute over land. They were the first two persons of mankind, ‘sons of Adams’. Kabeel envied his brother Habeel and killed him because the later did a better job than the former. The Holy Quran does not mention the names of Kabeel and Habeel explicitly, but their names are mentioned in the Israelites' affaires. According to the Quran the two brothers may be Adam's real sons, or any other two persons who are considered as Adam's sons for he was the first patriarch of mankind. Verse 30 of the Surah of Al-Maidah says: "The (selfish) soul of the other led him to the murder of his brother: he slew him, and became himself one of the losers."
According to Islam, the killer is the loser, and the killed person is the winner, for the latter did not commit any crime, but on the contrary was religious and pious.
According to the prevailing culture of people, the killed person is considered the loser, yet Islam tells us otherwise and that the killer has lost the world and eternity because he killed his brother.