that they were angels the Scripture testifies, not only in this book of Genesis, in which these transactions are related, but also in the Epistle to the Hebrews, where in praising hospitality it is said, "For thereby some have entertained angels unawares."[298] By these three men, then, when a son Isaac was again promised to Abraham by Sarah, such a divine oracle was also given that it was said, "Abraham shall become a great and numerous nation, and all the nations of the earth shall be blessed in him."[299] And here these two things are promised with the utmost brevity and fulness,--the nation of Israel according to the flesh, and all nations according to faith. 30. _Of Lot's deliverance from Sodom, and its consumption by fire from heaven; and of Abimelech, whose lust could not harm Sarah's chastity._ After this promise Lot was delivered out of Sodom, and a fiery rain from heaven turned into ashes that whole region of the impious city, where custom had made sodomy as prevalent as laws have elsewhere made other kinds of wickedness. But this punishment of theirs was a specimen of the divine judgment to come. For what is meant by the angels forbidding those who were delivered to look back, but that we are not to look back in heart to the old life which, being regenerated through grace, we have put off, if we think to escape the last judgment? Lot's wife, indeed, when she looked back, remained, and, being turned into salt, furnished to believing men a condiment by which to savour somewhat the warning to be drawn from that example. Then Abraham did again at Gerar, with Abimelech the king of that city, what he had done in Egypt about his wife, and received her back untouched in the same way. On this occasion, when the king rebuked Abraham for not saying she was his wife, and calling her his sister, he explained what he had been afraid of, and added this further, "And yet indeed she is my sister by the father's side, but not by the mother's;"[300] for she was Abraham's sister by his own father, and so near of kin. But her beauty was so great, that even at that advanced age she could be fallen in love with. 31. _Of Isaac, who was born according to the promise, whose name was given on account of the laughter of both parents._