Genesis 4
2 Ref Again she gave birth, to Cain's brother Abel. Abel was a keeper of sheep, but Cain was a tiller of the ground.
3 Ref As time passed, it happened that Cain brought an offering to Yahweh from the fruit of the ground.
4 Ref Abel also brought some of the firstborn of his flock and of the fat of it. Yahweh respected Abel and his offering,