《旧唐书·列传·卷四十》
四年，他以年老多病辞宰相职务，批准了，又调任冬官侍郎，依旧兼修国史。
四年，以老疾请罢知政事，许之，累转冬官侍郎，仍依旧兼修国史。
Four years later, he resigned from the post of Prime Minister due to his old age and illness, which was approved. Then he was transferred to Minister of Winter District, and still concurrently worked on China's national history.