By faith Abel offered to God a sacrifice more acceptable than that of Cain, through which he had witness borne to him that he was righteous, God giving the testimony by accepting his gifts; and through it he, although he is dead, still speaks.

We are not to be like Cain, who belonged to the Evil One, and murdered his brother. And why did he murder him? It was because his own deeds were evil, and his brother's, righteous.

Alas for them! They have walked in the path of Cain; for the sake of gain they have rushed headlong into Balaam's error, and have perished in Koran's rebellion.