《韩非子·内储说上七术》
嗣公对关吏说： 某时有个客商经过你的地方，给了你金，你才放他走的。 
嗣公为关吏曰： 某时有客过而所，与汝金，而汝因遣之。 
Si said to the officer: At such and such time there was a merchant who passed through your place, gave you sone gold and you let him pass.