《太平广记·卷三十六·神仙三十六》
当时是唐高宗永徽元年，天下富足。北海常常有认识李清的，因此齐鲁一带跟着李清学道术的有上百上千人。
时高宗永徽元年，天下富庶，而北海往往有知清者，因是齐鲁人从而学道术者凡百千辈。
It was the first year of Emperor Gaozong's Yong political era in the Tang Dynasty. The country was wealthy. There were often people from Beihai who knew Li Qing, so there were hundreds and thousands of people in the Qilu area who followed Li Qing to study Taoism.