Genesis 4:3-7
3 Some time later, Cain presented an offering to the Lord from the land’s crops 4 while Abel presented his flock’s oldest offspring with their fat. The Lord looked favorably on Abel and his sacrifice 5 but didn’t look favorably on Cain and his sacrifice. Cain became very angry and looked resentful. 6 The Lord said to Cain, “Why are you angry, and why do you look so resentful? 7 If you do the right thing, won’t you be accepted? But if you don’t do the right thing, sin will be waiting at the door ready to strike! It will entice you, but you must rule over it.”