《资治通鉴·周纪·周纪二》
楚王让登徒直先把象牙床护送回去，登徒直不愿意去，对孟尝君的食客公孙戌说： 这象牙床价值千金，万一有丝毫的损伤，即便把妻儿卖了也偿还不起。
登徒直送之，不欲行，谓孟尝君门人公孙戌曰： 象床之直千金，苟伤之毫发，则卖妻子不足偿也。
King Chu asked Dengtuzhi to **** the ivory bed back first, but Dengtuzhi refused to go. He said to Meng Changjun's guest Gongsunxu: This ivory bed is worth a thousand gold, and if there is the slightest damage, even if I sell my wife and children, I will not be able to repay it.