Genesis 19:2

2.Nay, but we will abide in the street. The angels do not immediately assent, in order that they may the more fully investigate the disposition of the holy man. For he was about to bring them to his own house, not merely for the sake of supplying them with a supper, but for the purpose of defending them from the force and injury of the citizens. Therefore the angels act, as if it were safe to sleep on the highway; and thus conceal their knowledge of the abandoned wickedness of the whole people. For if the gates of cities are shut, to prevent the incursions of wild beasts and of enemies; how wrong and absurd it is that they who are within should be exposed to still more grievous dangers? Therefore the angels thus speak, in order to make the wickedness of the people appear the greater. And Lot, in urging the angels to come unto him, for the purpose of protecting them from the common violence of the people, the more clearly shows, how careful he was of his guests, lest they should suffer any dishonor or injury.