《资治通鉴·汉纪·汉纪一》
李必、骆甲说： 我们原是秦朝的人，恐怕军中将士不信服我们，因此甘愿辅佐大王您身边善于骑射的将领。 
汉王欲拜之，必、甲曰： 臣故秦民，恐军不信；愿得大王左右善骑者傅之。 
Li Bi and Luo Jia said, "We are originally from the Qin dynasty, and we are afraid that the officers and soldiers will not trust us. Therefore, we are willing to assist the skilled archers and cavalrymen by your side."