《资治通鉴·唐纪·唐纪三》
己酉，突厥使节前来通报始毕可汗讣闻，高祖在长乐门举行哀悼仪式，三天不上朝，命百官到使者住所吊唁。
己酉，突厥遣使来告始毕可汗之丧，上举哀于长乐门，废朝三日，诏百官就馆吊其使者。
On the jiyou day, a Turkic embassy arrived to report the death of their khan Shibi, whereupon the emperor mourned at the Chang’an Gate, and did not receive court officials for three days. He ordered all the officials to go to the Turkic embassy to pay their respects.