Genesis 18:29

And he spake [unto him] yet again, and said
Being encouraged by such a gracious answer: Peradventure there shall be forty found there;
forty righteous persons; and, from preceding passages, it must be supplied,

``wilt thou destroy and not spare the place for their sakes?''

and he said, I will not do [it] for forty's sake;
but spare them for their sake.