'Itself' in the Bible

Thirsting for riches, they will trade on you with their canting talk. From of old their judgement has been working itself out, and their destruction has not been slumbering.

Their case is that described in the true proverb, "A dog returns to what he has vomited," and also in the other proverb, "The sow has washed itself and now goes back to roll in its filth."