《太平广记·卷三十八·神仙三十八》
唐玄宗认为他不一般，把他召入楼中，问清他的姓名之后便说： 原来是半千岁的孙子，应该如此。 
玄宗奇之，召入楼中，问姓名。乃曰： 半千之孙，宜其若是。 
Emperor Xuanzong of Tang believed that he was extraordinary and called him into the building. After asking his name, he said: "So he is Ban's grandson, it should be like this."