Cain was very wroth; partly with God, who, had cast so public a disgrace upon him, and given the preference to his younger brother; and partly with Abel, because he had received more honour from God, and therefore was likely to have more respect and privilege from his parents than himself. His countenance fell; whereas before it was lifted up and cheerful, now it fell down through sense of guilt, disappointment of his hope, shame and grief, and envy at his brother.
Related Commentaries of Genesis 4:5
Genesis 4:5
5 But unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell.