Thematic Bible: Cain and abel

And Abel also presented [an offering]-some of the firstborn of his flock and their fat portions. The Lord had regard for Abel and his offering, but He did not have regard for Cain and his offering. Cain was furious, and he was downcast. Then the Lord said to Cain, "Why are you furious? And why are you downcast? read more.
If you do right, won't you be accepted? But if you do not do right, sin is crouching at the door. Its desire is for you, but you must master it."