Jamieson, Fausset and Brown on Genesis 20:11

11. And Abraham said ... I thought, Surely the fear of God is not in this place--From the horrible vices of Sodom he seems to have taken up the impression that all other cities of Canaan were equally corrupt. There might have been few or none who feared God, but what a sad thing when men of the world show a higher sense of honor and a greater abhorrence of crimes than a true worshipper!