Genesis 4:1-7
Cain and Abel
41 Now Adam knew Eve his wife, and she conceived and bore Cain, saying, "I have gotten a man with the help of the Lord." 2 And again, she bore his brother Abel. Now Abel was a keeper of sheep, and Cain a tiller of the ground.
3 In the course of time Cain brought to the Lord an offering of the fruit of the ground, 4 and Abel brought of the firstlings of his flock and of their fat portions. And the Lord had regard for Abel and his offering, 5 but for Cain and his offering he had no regard. So Cain was very angry, and his countenance fell.
6 The Lord said to Cain, "Why are you angry, and why has your countenance fallen? 7 If you do well, will you not be accepted? And if you do not do well, sin is couching at the door; its desire is for you, but you must master it."
Matthew Henry's Commentary on Genesis 4:1-7