By faith Abel offered unto God a sacrifice of more excellence than Cain, by which he received a testimony that he was a righteous man, God bearing witness upon his gifts: and by this, though dead, he still speaketh.

Not as Cain, who was of the wicked one, and slew his brother: and wherefore did he slay him? Because his own works were wicked, and those of his brother righteous.

Wo unto them! for they have walked in the way of Cain, and have eagerly run in Balaam's erroneous path of hire, and have perished in opposition, like Corah.