The Pulpit Commentary - Genesis 18:28
Peradventure there shall lack five of the fifty righteous: wilt thou destroy all the city for lack of five? Literally, on account of five, i.e. because they are wanting. A rare example of holy ingenuity in prayer. Abraham, instead of pleading for the city's safety on account of forty-five, deprecates its destruction on account of five. And its said, If I find there forty and five, I will not destroy it. read more
The Pulpit Commentary - Genesis 18:27
And Abraham answered and said (being emboldened by the success of his first petition), Behold now, I have taken upon me , literally, I have begun, though here perhaps used in a more emphatic sense: I have undertaken or ventured— to speak unto the Lord —Adonai ( Genesis 15:2 )— which am but dust and ashes . "Dust in his origin and ashes in his end" (Delitzsch; vide Genesis 3:19 ). read more