Genesis 18:26-30

So the Lord said, “If I find in Sodom fifty righteous within the city, then I will spare the entire place on their account.”

And Abraham replied, “Now behold, I have ventured to speak to the Lord, although I am only dust and ashes.

Suppose the fifty righteous are lacking five, will You destroy the entire city because of five?” And He said, “I will not destroy it if I find forty-five there.”

And he spoke to Him yet again and said, “Suppose forty are found there?” And He said, “I will not do it on account of the forty.”

Then he said, “Oh may the Lord not be angry, and I shall speak; suppose thirty are found there?” And He said, “I will not do it if I find thirty there.”