Then Abraham answered and said, "Indeed now, I who am but dust and ashes have taken it upon myself to speak to the Lord:
Genesis 18:27
Surrounding context
18:26 So the LORD said, "If I find in Sodom fifty righteous within the city, then I will spare all the place for their sakes."
18:27 Then Abraham answered and said, "Indeed now, I who am but dust and ashes have taken it upon myself to speak to the Lord:
18:28 Suppose there were five less than the fifty righteous; would You destroy all of the city for lack of five?" So He said, "If I find there forty-five, I will not destroy it."