《新唐书·列传·卷二十一》
其后父亲卧病，历时十旬，玄龄衣不解带尽心服侍；去世后，酌饮不入口达五天之久。
会父疾，绵十旬，不解衣；及丧，勺饮不入口五日。
Later when his father fell ill, Xuanling took care of him day and night for ten months; After his passing, Xuanling did not eat or drink for five days.