《晋书·志·第十九章》
骑到零陵泾溪，奔走不同寻常，桓玄停下车驾饮牛，牛直入江水中不再出来。
乘至零陵泾溪，骏驶非常，息驾饮牛，牛迳入江水不出。
He rode his new bull to Lingling JIngxi, whose exceptional speed was unusual. Huan Xuan had his carriage stop to give the bull a drink. The bull walked right into the river and never came out again.