《汉书·传·霍光金日磾传》
每当他出入殿门的时候，前进、停止的时候都有固定的位置。郎仆射暗中做记号来观察，发现不差分毫，他的资质就像这样端正。
每出入下殿门，止进有常处，郎仆射窃识视之，不失尺寸，其资性端正如此。
Whenever he enters and leaves the palace gate, he has a fixed position when he advances and stops. Lang Pu shot secretly makes marks to observe, and finds that there is no difference in hair, so his qualifications are as upright as this.