《史记·七十列传·司马穰苴列传》
就斩了使者的仆从，砍断了左边的夹车木，杀死了左边驾车的马，向三军巡行示众。
乃斩其仆，车之左驸，马之左骖，以徇三军。
So, he executed the envoy's servant, cut off the crossbar on the left side of the carriage, and killed the horse on the left. The body was then paraded around the three armies as a warning.