《资治通鉴·隋纪·隋纪三》
当时杨勇的卫士都带着火燧，杨勇命令工匠制做了几千枚火燧，打算分赐给身边的人；现在，库中的火燧都被收缴。
时卫士皆佩火燧，勇命工造数千枚，欲以分赐左右；至是，获于库。
At that time, Yang Yong's guards were all carrying fire flints, and Yang Yong ordered the craftsmen to make several thousand fire flints, which he planned to distribute to the people around him; now, all of the fire flints in the storeroom were confiscated.