'Themselves' in the Bible

Woe to them! For they have traveled down Cain's path, and because of greed have abandoned themselves to Balaam's error; hence, they will certainly perish in Korah's rebellion.

These men are dangerous reefs at your love feasts, feasting without reverence, feeding only themselves. They are waterless clouds, carried along by the winds; autumn trees without fruit -- twice dead, uprooted;