OT.- Caín and Abel 

GÉNESIS 4: 1-16

Cain’s fratricide of Abel—both sons of Adam and Eve—occurred after the brothers presented their offerings to God, who favored the offering brought by Abel, a shepherd. The scene depicts Cain, a tiller of the soil, killing Abel in the fields in a fit of rage because God did not prefer his offering—an act that subsequently filled him with deep guilt.

In this passage, envy and selfishness are portrayed as inherent to human nature, while the sacrificial sheep points toward the redemption of sin.