《资治通鉴·陈纪·陈纪七》
北周国主攻下并州以后，又派韦孝宽去招降，叫他的儿子送去上大将军、武乡公等官爵的委任状和用金子、玛瑙制成的酒杯作为凭据。
周主既克并州，复遣韦孝宽招之，令其子以上大将军、武乡公告身及金、马脑二酒钟赐伏为信。
After the northern Zhou emperor attacked and captured Bingzhou, he dispatched Wei Xiaokuan to persuade Fu Fu to surrender, sending Fu Fu’s son to deliver letters of credence and gold and agate wine cups as tokens of high-ranking offices: Lord of Wuxiang and Grand General.