《明史·列传·卷一百九十九》
从此，这些土知府三年入朝廷献贡物一次，成为常规，其间有人受到朝廷的恩赐，则会进献马匹和土产以表示谢恩。
自是，诸土知府三年一入贡，以为常，或有恩赐，则进马及方物谢恩。
From then on, these local magistrates routinely offered tribute to the court once every three years. Those who received imperial favours would offer horses and local products to express their gratitude.