《礼记·服问》
国君的母亲如果是妾，不是夫人，则群臣不为之服丧；只有国君的近臣、驾车的以及车右随着国君为之服丧，国君穿什么样的丧服，这些人就随着穿什么样的丧服。
唯近臣及仆骖乘从服，唯君所服，服也。公为卿大夫锡衰以居，出亦如之。
If the mother of the monarch is a concubine, not a wife, then the courtiers will not mourn for it; only the close ministers of the monarch, the coachman and the carriage driver will mourn for it with the monarch. No matter what kind of mourning clothes the monarch wears, these people will wear it accordingly.