《资治通鉴·后唐纪·后唐纪二》
当时天气正值大旱，后唐帝从邺都把诚惠迎接到洛阳，请他祈雨，士民们从早到晚都来看他祈雨，结果好几十天过去了也没下雨。
时大旱，帝自鄴都迎诚惠至洛阳，使祈雨，士民朝夕瞻仰，数旬不雨。
At that time, it was a severe drought. Emperor Li Siyuan welcomed Cheng Hui from Yedu to Luoyang and asked him to pray for rain. The soldiers and civilians watched him praying for rain from morning till night. However, dozens of days passed without rain.