Genesis 4:4-7

4But Abel brought to God some of the first lambs that his sheep had given birth to. He brought pieces of fat from the best of his lambs to offer them to God. Abel and his gift pleased the Lord.

5But God was not pleased with Cain and his gift. So Cain became very angry. His face looked sad.

6Then the Lord said to Cain, ‘Why are you angry? Why do you look sad?

7If you do what is right, I will accept you. But if you do not do the right thing, sin will be very near to you. It will be like a wild animal at your door that is ready to eat you. But you must become its master.’