Genesis 4:5

2 Again she gave birth, to Cain`s brother Abel. Abel was a keeper of sheep, but Cain was a tiller of the ground.

3 As time passed, it happened that Cain brought an offering to Yahweh from the fruit of the ground.

4 Abel also brought some of the firstborn of his flock and of the fat of it. Yahweh respected Abel and his offering,

5 but he didn`t respect Cain and his offering. Cain was very angry, and the expression on his face fell.

6 Yahweh said to Cain, "Why are you angry? Why has the expression of your face fallen?

7 If you do well, will it not be lifted up? If you don`t do well, sin crouches at the door. Its desire is for you, but you are to rule over it."

8 Cain said to Abel, his brother, "Let`s go into the field." It happened, when they were in the field, that Cain rose up against Abel, his brother, and killed him.