Genesis 18:25-29

Far be it from You to do such a thing, to kill the righteous with the wicked, so that the righteous and the wicked are treated alike. Far be it from You! Shall not the Judge of all the earth deal justly?”

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.”