《宋书·志·卷十七》
右丞徐爰认为： 《礼记》， 服总麻之丧不举行祭祀 ，是普遍要求。
右丞徐爰议以为： 《礼》， 缌不祭 ，盖惟通议。
Xu Yuan, the Right Chancellor, believed that: It is a universal requirement in the Book of Rites that sacrifices can not be held during a mourning period with a garment made of fine hemp cloth.