《资治通鉴·陈纪·陈纪五》
后主因为曾经和祖立下重誓，所以没有杀他，只解除祖侍中、仆射的官职，派出任北徐州刺史。
帝以尝与之重誓，故不杀，解珽侍中、仆射，出为北徐州刺史。
The last emperor did not kill him because he had previously made a solemn oath to Zu, he only dismissed Zu's positions as privy counsellor and servant, and sent him out to serve as governor of northern Xuzhou.