Woe unto them! for they have gone in the way of Cain, and ran greedily after the error of Balaam for reward, and perished in the rebellion of Korah.
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Aquinas Study Bible
AD 2017
Gone in the way, etc: Heretics follow the way of Cain, by murdering the souls of their brethren; the way of Balaam, by putting a scandal before the people of God, for their own private ends; and the way of Core or Korah, by their opposition to the church governors of divine appointment. (Bishop Richard Challoner)
They have imitated, or gone in the way of Cain, who murdered his brother; and they have a mortal hatred against the faithful. They have imitated Balaam and his covetousness, (see 2 Peter ii. 15.) and Core, (Numbers xvi.) who with others opposed Moses; and as these sinners perished, so will they. (Witham)
Way Heretics follow the way of Cain, by murdering the souls of their brethren; the way of Balaam by putting a scandal before the people of God, for their own private ends; and the way of Core or Korah, by their opposition to the church governors of divine appointment. (Challoner)