Genesis 18:31

And he said, behold now, I have taken upon me to speak unto the Lord ,.... See Gill on Genesis 18:27 ,

Peradventure there shall be twenty found there ; wouldest thou destroy it, such a number being in it; or, wouldest thou spare it for their sakes?

and he said, I will not destroy it for twenty's sake ; if there were no more in it, I would spare it for their sake.