“And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the LORD had respect unto Abel and to his offering: But unto Cain and to his offering he had not respect.” (Gen 4:4-5).
Abel was a sheepherder.
He took care of sheep. Cain was a tiller of the land. He took care of crops. When it came time to offer God a sacrifice, Abel took the firstlings of his flock, that is the …