《史记·十二本纪·秦始皇本纪》
二十年，燕国太子丹担忧秦国的军队来到燕国，心里慌恐不安，派遣荆轲刺杀秦王。
二十年，燕太子丹患秦兵至国，恐，使荆轲刺秦王。
In the twentieth year, Prince Dan of Yan was worried about the arrival of Qin's army in Yan, and he was worried. He sent Jing Ke to assassinate King Qin.