《资治通鉴·汉纪·汉纪八》
现在王信虽然是皇后的哥哥，但没有立功，如果封他为侯，就违背了前约。 
今信虽皇后兄，无功，侯之，非约也。 
Now Wang Xin may be the empress's elder brother, but he has not accomplished any meritorious deeds. If he is granted a marquisate, it will violate the previous agreement.