By faith Abel offered up to God a more acceptable sacrifice than Cain, through which he received the witness that he was righteous, God witnessing to his gifts: and through it he having died is still speaking.

not as Cain was of the evil one, and slew his brother; and on account of what did he slay him? Because his own works were evil, and those of his brother righteous.

Woe unto them! because they have gone off in the way of Cain, and in the delusion of Balaam they have been seduced by reward, and they perished in the gainsaying of Korah.