'Back' in the Bible

For it would have been better for them not to have fully known the way of righteousness, than, after knowing it, to turn back from the holy commandments in which they were instructed.

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."