《水经注·卷五》
有一只老虎藏身在芦苇中，穆天子将到时，禁卫军勇士高奔戎活捉了老虎献给他。穆天子叫他做了一个虎栏，把虎养在东貌，因而叫虎牢。
有虎在于葭中，天子将至，七萃之士高奔戎生捕虎而献之天子，命之为柙言之东虢，是曰虎牢矣。
A tiger was hiding in the reeds. When Mu Tianzi was about to arrive, Gao Benrong, a warrior of the Imperial Guard, captured the tiger alive and presented it to him. Mu Tianzi asked him to make a tiger enclosure and raise a tiger in Dongmao, so it was called Hulao.