《资治通鉴·陈纪·陈纪十》
隋朝上柱国杞公宇文忻与隋文帝少年时交情深厚，他善于用兵，有威信声望。
上柱国杞公宇文忻与隋主少相厚，善用兵，有威名。
Sui Dynasty's Duke of Qiguo Yuwen Xin of Shangzhu Guo was close friends with Emperor Wen of Sui during their youth and was skilled in using weapons and was respected and well-known.