Genesis 19:3

And he pressed upon them greatly; and they turned in unto him, and entered into his house; and he made them a feast, and did bake unleavened bread, and they did eat. Lot did his duty as Oriental host. His invitation becoming so very urgent, the angels consented to remain in his house overnight, where he personally superintended their entertainment. This is one of the instances to which the writer to the Hebrews has reference when he writes: "Be not forgetful to entertain strangers; for thereby some have entertained angels unawares. " Hebrews 13:2.