《旧五代史·后唐·庄宗纪三》
传真师在广明年间京师动乱时得到，秘藏四十年。篆文古体，人不认识，到现在献上。
传真师于广明中，遇京师丧乱得之，秘藏已四十年矣。篆文古体，人不之识，至是献之。
Master Chuanzhen had obtained it during the chaos in the capital in the Guangming era and kept it hidden for forty years. It was written in an ancient seal script that no one could recognize, and he had only now presented it.