26 And the Lord said, "If I find at Sodom fifty righteous in the city, I will forgive the whole place for their sake." 27 Abraham answered, "Let me take it upon myself to speak to the Lord, I who am but dust and ashes. 28 Suppose five of the fifty righteous are lacking? Will you destroy the whole city for lack of five?" And he said, "I will not destroy it if I find forty-five there." 29 Again he spoke to him, "Suppose forty are found there." He answered, "For the sake of forty I will not do it." 30 Then he said, "Oh do not let the Lord be angry if I speak. Suppose thirty are found there." He answered, "I will not do it, if I find thirty there." 31 He said, "Let me take it upon myself to speak to the Lord. Suppose twenty are found there." He answered, "For the sake of twenty I will not destroy it." 32 Then he said, "Oh do not let the Lord be angry if I speak just once more. Suppose ten are found there." He answered, "For the sake of ten I will not destroy it." 33 And the Lord went his way, when he had finished speaking to Abraham; and Abraham returned to his place.
Matthew Henry's Commentary on Genesis 18:26-33
Commentary on Genesis 18:23-33
(Read Genesis 18:23-33)
Here is the first solemn prayer upon record in the Bible; and it is a prayer for the sparing of Sodom. Abraham prayed earnestly that Sodom might be spared, if but a few righteous persons should be found in it. Come and learn from Abraham what compassion we should feel for sinners, and how earnestly we should pray for them. We see here that the effectual, fervent prayer of a righteous man avails much. Abraham, indeed, failed in his request for the whole place, but Lot was miraculously delivered. Be encouraged then to expect, by earnest prayer, the blessing of God upon your families, your friends, your neighbourhood. To this end you must not only pray, but you must live like Abraham. He knew the Judge of all the earth would do right. He does not plead that the wicked may be spared for their own sake, or because it would be severe to destroy them, but for the sake of the righteous who might be found among them. And righteousness only can be made a plea before God. How then did Christ make intercession for transgressors? Not by blaming the Divine law, nor by alleging aught in extenuation or excuse of human guilt; but by pleading HIS OWN obedience unto death.