《资治通鉴·汉纪·汉纪五十六》
刘表感到奇怪，问他是什么原因，刘备说： 我平常身不离马鞍，大腿内侧没有什么肉。
表怪，问备，备曰： 平常身不离鞍，髀肉皆消。
Liu Biao was puzzled and asked him why. Liu Bei said: I am usually inseparable from the saddle, and there is no meat on the inside of my thighs.