Genesis 4:4-7 NIV

4 And Abel also brought an offering—fat portions from some of the firstborn of his flock. The LORD looked with favor on Abel and his offering,

References for Genesis 4:4

5 but on Cain and his offering he did not look with favor. So Cain was very angry, and his face was downcast.
6 Then the LORD said to Cain, “Why are you angry? Why is your face downcast?

References for Genesis 4:6

7 If you do what is right, will you not be accepted? But if you do not do what is right, sin is crouching at your door; it desires to have you, but you must rule over it.”

References for Genesis 4:7