God repeatedly assures Abram that he will be the father of many nations - as many descendants as stars in the sky or grains of sand on the shore. But there's only one problem. Both he and his wife Sarai are old; too old to have children, it would seem. When God - in the appearance of a traveler - tells newly-renamed Abraham and Sarah that she will have a son within the year, she can only laugh. But God has the last laugh.
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