《战国策·齐六·燕攻齐取七十余城》
齐桓公威服天下之后，召集诸侯会盟，曹沫就凭着一柄宝剑，在祭坛之上劫持桓公，从容不迫，义正辞严，一朝收回失地，天下为之震动。
齐桓公有天下，朝诸侯。曹子以一剑之任，劫桓公于坛位之上，颜色不变，而辞气不悖。
After Duke Huan of Qi conquered the world, he summoned the vassals to the meeting of the princes. Cao Mo took advantage of a precious sword to seize Duke Huan at the altar. He was unhurried and spoke with dignity and sternness, and recovered the lost land in a single, shocking move.