By faith Abel offered to God a more excellent sacrifice than Cain, by which he obtained testimony that he was righteous, God testifying of his gifts: and by it he being dead yet speaketh.

Not as Cain, who was of that wicked one, and slew his brother. And why did he slay him? Because his own works were evil, and his brother's righteous.

Woe to them! for they have gone in the way of Cain, and run greedily after the error of Balaam for reward, and perished in the gainsaying of Core.