《后汉书·本纪·显宗孝明帝纪》
四年春二月十一日，明帝诏令说 ：我亲耕藉田中，告祀先农，希望农事丰收。
四年春二月辛亥，诏曰： 朕亲耕藉田，以祈农事。
In the spring of the fourth year, on the eleventh day of the second month, Emperor Ming issued an edict, saying: "I will personally cultivate the Jizhong Field and offer sacrifices to the Ancestor of Agriculture, in the hope of a plentiful harvest."