Genesis 4:5

But unto Cain... he had not respect.

It was not an offering made in the obedience of faith. Cain came with. thank-offering, such as the most righteous person might offer, but he brought no sin offering as. sinner. He set up his own plan of worship against God's, or rather, left off the part of God's plan that did not suit him. Hence, the approval manifested to Abel's sacrifice was withheld from Cain's offering.

Cain was very wroth.

Instead of correcting his error when he found that he had not worshiped according to the divine pleasure he was filled with anger against God and against his more favored brother. Filled with self-righteous pride, he did not confess that the fault was in himself, but blamed God with favoritism.

His countenance fell.

His displeasure showed itself in his cast down and morose countenance, his very face displaying the ill humor that rankled in his bosom.