《韩非子·说疑》
奸臣又会派出诡诈的人，在外充当别国宠信的使者，把马车借给他，给他瑞节使人相信，教他外交辞令使他庄重，用贵重的礼物资助他，让他作为外国使者来游说本国君主，暗中夹带为奸臣说话的私心而议论公事。
彼又使谲诈之士，外假为诸侯之宠使，假之以舆马，信之以瑞节，镇之以辞令，资之以币帛，使诸侯淫说其主，微挟私而公议。
Treacherous ministers would then send out crafty people to pretend to be envoys greatly favored by other countries, lend him royal carriages, give him imperial credentials to convince him, teach him diplomatic language to make him serious, support him materially with expensive gifts, and order him to, as an envoy from other countries, lobby the monarch of this country, secretly speaking for the treacherous ministers when discussing state affairs.