话说唐朝时期，长安城里有一位名叫李白的诗人，他的一首诗在民间广为流传，据说这首诗预言了未来的一场大旱。当时人们半信半疑，但李白却斩钉截铁地说："我所写之诗，字字珠玑，千真万确，旱灾必至！"果然，不出半年，一场百年不遇的大旱席卷了整个关中平原，百姓流离失所，哀鸿遍野。这场灾难让大家不得不相信李白的预言，从此以后，李白的诗句便被视为神谕，无人敢质疑其真实性。李白也因此名声大噪，被后世尊称为"诗仙"。
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