《资治通鉴·汉纪·汉纪一》
我与各路诸侯约定，先入关中的人为王。据此我就应该在关中称王了。
吾与诸侯约，先入关者王之，吾当王关中。
I have an agreement with the feudal lords of various routes that the first person to enter Guanzhong will be the king. According to this principle, I ought to take the throne in Guanzhong.