Genesis 4:4-7 NIV

4 But Abel brought fat portions1 from some of the firstborn of his flock.2 The LORD looked with favor on Abel and his offering,3

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?4 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;5 it desires to have you, but you must master it.6"

References for Genesis 4:7