Genesis 18:31-33 King James Version (KJV)
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.