Abel, the second son of Adam and Eve, was murdered by his brother Cain.
Abel was a shepherd and Cain was a farmer. They both made an offering to the Lord from the fruits of their labor. The Lord expressed favor toward Abel's offering, but rejected Cain's. In a fit of jealousy, Cain killed his brother (Genesis 4:2-8).
In the New Testament, Abel is called righteous (Matthew 23:35), and is named by Jesus as a just and innocent man who suffers and is killed (Luke 11:51). Abel's sacrifice is judged greater than Cain's because of his faith, and this faith speaks beyond the grave (Hebrew 11:4).