《新唐书·列传·卷六十七》
我朝太宗皇帝去世，留下诏令也说只服丧三十六天，百官不忍心，下葬除服后，差不多服了四个月的丧。
我太宗文皇帝崩，遗诏亦三十六日，群臣不忍，既葬而除，略尽四月。
When Emperor Taizong of our dynasty died, he left a will saying that one should only mourn him for thirty-six days. The ministers could not bear to do this, and after the burial and mourning were finished, they ended up mourning him for almost four months.