Genesis 18:31-33

31 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.
32 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.
33 And the LORD went his way, as soon as he had left communing with Abraham: and Abraham returned unto his place.