Genesis 4:3-8

3And in process of time it came to pass, that Cain brought of the fruit of the ground an offering unto Jehovah. 4And Abel, he also brought of the firstlings of his flock and of the fat thereof. And Jehovah had respect unto Abel and to his offering: 5but unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell. 6And Jehovah said unto Cain, Why art thou wroth? and why is thy countenance fallen? 7If thou doest well, shall it not be lifted up? and if thou doest not well, sin coucheth at the door; and unto thee shall be its desire; but do thou rule over it. 8And Cain told Abel his brother. And it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.