The second son of Adam and Eve who was murdered by his elder brother Cain because of Cain’s jealousy since God accepted Abel’s offering while rejecting his. Abel, the one who tended the flock, offered the “first-born” while Cain, the one who looked after the fields, brought “some” of the produce of the soil hence God was pleased with Abel’s offering.

See Genesis 4: 1-15

“Adam and Eve mourning the death of Abel”