Genesis 4:5-7 NIV

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?1 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;2 it desires to have you, but you must master it.3"

References for Genesis 4:7