Genesis 20:4 - Joseph Benson’s Commentary on the Old and New Testaments

Wilt thou also slay a righteous nation? He probably referred to the late destruction of Sodom and the cities of the plain, which, no doubt, must have caused great consternation, if not also some degree of reformation, in that neighbourhood. As Abimelech's plea was not rejected by the Lord, there is reason to hope that both he and his subjects were not only free from the abominations of Sodom, and from the reigning idolatries of Canaan, but that the fear of God, and some remains of true religion, were found among them.