It was by faith that Abel offered God a richer sacrifice than Cain did, and thus won from God the record of being 'just,' on the score of what he gave; he died, but by his faith he is speaking to us still.

we are not to be like Cain, who belonged to the evil One and slew his brother. And why did he slay him? Because his own deeds were evil and his brother's just.

Woe to them! they go the road of Cain, rush into Balaam's error for what it brings them, and perish in Korah's rebellion.