Genesis 18:30

Peradventure there shall lack five of the fifty righteous: wilt thou destroy all the city for [lack of] five? And he said, If I find there forty and five, I will not destroy [it].

And he spake unto him yet again, and said, Peradventure there shall be forty found there. And he said, I will not do [it] for forty's sake.

And he said, Behold now, I have taken upon me to speak unto the Lord: Peradventure there shall be twenty found there. And he said, I will not destroy [it] for twenty's sake.

And he said, Oh let not the Lord be angry, and I will speak yet but this once: Peradventure ten shall be found there. And he said, I will not destroy [it] for ten's sake.