《宋书·志·卷十五》
考察周代的礼制，为自己的兄弟除去丧服之后，到了他的灵柩安葬的时候，又要返穿丧服轻丧服虽然除去，还要穿上齐衰重丧服亲临丧葬。
案周礼，为兄弟既除丧已，及其葬也，反服其服。轻丧虽除，犹齐衰以临葬。
According to the etiquette system of the Zhou Dynasty, after removing the mourning clothes for his brother, when his coffin was buried, he had to put on the mourning clothes again. Although the mourning clothes were removed, he still had to wear Qi Cui's heavy mourning clothes to attend the funeral.