Genesis 18:26

22 And the two men turned away and went toward Sodom, but Abraham remained standing before the LORD.

23 Abraham stepped forward and said, “Will You really sweep away the righteous with the wicked?

24 What if there are fifty righteous ones in the city? Will You really sweep it away and not spare the place for the sake of the fifty righteous ones who are there?

25 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! Will not the Judge of all the earth do what is right?”

26 So the LORD replied, “If I find fifty righteous ones within the city of Sodom, on their account I will spare the whole place.”

27 Then Abraham answered, “Now that I have ventured to speak to the Lord—though I am but dust and ashes—

28 suppose the fifty righteous ones lack five. Will You destroy the whole city for the lack of five?” He replied, “If I find forty-five there, I will not destroy it.”

29 Once again Abraham spoke to the LORD, “Suppose forty are found there?” He answered, “On account of the forty, I will not do it.”

30 Then Abraham said, “May the Lord not be angry, but let me speak further. Suppose thirty are found there?” He replied, “If I find thirty there, I will not do it.”

Read all of Genesis 18