《晋书·列传·第三章》
适逢谒者阳翟郭玄信奉命出使，寻求驾车者，司马把石苞及邓艾给了他。
会谒者阳翟郭玄信奉使，求人为御，司马以苞及邓艾给之。
It just happened that an envoy from Yangdi in Guoxuan was ordered to go on a mission and was looking for coachmen, so Sima assigned Shi Bao and Deng Ai to him.