Genesis 18:26-32

So the LORD said, “If I find in Sodom fifty righteous within the city, then I will spare the whole place on their account.” And Abraham replied, “Now behold, I have ventured to speak to the Lord, although I am but dust and ashes. Suppose the fifty righteous are lacking five, will You destroy the whole city because of five?” And He said, “I will not destroy it if I find forty-five there.” 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.” And he said, “Now behold, I have ventured to speak to the Lord; suppose twenty are found there?” And He said, “I will not destroy it on account of the twenty.” Then he said, “Oh may the Lord not be angry, and I shall speak only this once; suppose ten are found there?” And He said, “I will not destroy it on account of the ten.”