Genesis 4:3-5. And in process of time it came to pass that Cain brought of the fruit of the ground an offering unto the Lord. And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the Lord had respect unto Abel and to his offering. But unto Cain and to his offering he has not respect. And Cain was very wroth, and his countenance fallen.

Carnal offering and Holy offering – the difference is very clear.

Guiltless sacrifice and guilt sacrifice…

Firstling and fat are more excellent; don’t offer God “second best”.

Why are you angry? God has no respect for “inferior” offerings.