《太平广记·卷一百三十六·征应二》
他在分封的住处时，得了麻疹，病得很厉害。郭淑妃看见一条黄龙从他的卧室里出来，等皇上的病痛稍微减轻的时候，淑妃就把这件事全告诉了他。他说： 不要把这些话泄露出去，将来不会忘记你。 
在藩邸时，疾疹方甚，而郭淑妃见黄龙出于卧内。上疾稍退，妃具以状告，上曰： 无泄是言，贵不相忘。 
When he was in his fiefdom, he contracted measles and became seriously ill. Imperial Consort Guo saw a yellow dragon emerge from his bedroom, and after the emperor’s illness slightly improved, the imperial consort told him about this matter. He said: Do not spread these words, I will not forget you in the future.