'Themselves' in the Bible

But these people blaspheme anything they don’t understand. What they know by instinct like unreasoning animals—they destroy themselves with these things.

Woe to them! For they have traveled in the way of Cain, have abandoned themselves to the error of Balaam for profit, and have perished in Korah’s rebellion.

These are the ones who are like dangerous reefs at your love feasts. They feast with you, nurturing only themselves without fear. They are waterless clouds carried along by winds; trees in late autumn—fruitless, twice dead, pulled out by the roots;