Genesis 4:1-6 NKJV

1 Now Adam knew Eve his wife, and she conceived and bore Cain, and said, "I have acquired a man from the Lord."
2 Then she bore again, this time his brother Abel. Now Abel was a keeper of sheep, but Cain was a tiller of the ground.
3 And in the process of time it came to pass that Cain brought an offering of the fruit of the ground to the Lord.
4 Abel also brought of the firstborn of his flock and of their fat. And the Lord respected Abel and his offering,
5 but He did not respect Cain and his offering. And Cain was very angry, and his countenance fell.
6 So the Lord said to Cain, "Why are you angry? And why has your countenance fallen?