《旧唐书·列传·卷三》
这时李密的士卒缺少衣服，王世充的士卒缺少粮食，就提出互相交换，李密开始拒绝，邴元真贪图私利，多次劝说李密，李密就答应了。
时密兵少衣，世充兵乏食，乃请交易，密初难之，邴元真好求私利，屡劝密，密遂许焉。
At that time, Li Mi's soldiers lacked clothing, while Wang Shichong's lacked food. They proposed trading with each other. Li Mi refused at first, but Bing Yuanzhen, driven by greed, repeatedly advised Li Mi to accept, so he reluctantly agreed.