《尚书·夏书·禹贡》
甸服以外五百里是侯服。离甸服最近的一百里替天子服差役；二百里的，担任国家的差役；三百里的，担任侦察工作。
五百里侯服：百里采，二百里男邦，三百里诸侯。
Five hundred li outside Dianfu was Houfu. The nearest one hundred li from Dianfu served the Son of Heaven as servants; the two hundred li, served the state as servants; the three hundred li, performed reconnaissance work.