stop where a bed win named nasser offers travelers of all faith to share a meal with him. his meal is one like sarah and abraham might have offered to strangers who came to their home. >> at that meal, they announce that sarah now almost 90, will have a child. she laughs with incredulity. >> what sarah and abraham didn't know, the bible tells us, was that the visitors were actually angels bringing them a message from god. and it did come to pass. sarah gave birth to the child she had wanted for so long, a son named isaac. his descendants became the jewish people. next, a family feud that stretches back millennia as our journey around the world and across time continues when "back to the beginning with christiane amanpour" returns. [ sneezes, coughs ]