《史记·七十列传·春申君列传》
两虎相斗而劣狗趁机得到好处，不如与楚国亲善。
两虎相与斗而驽犬受其弊，不如善楚。
Two tigers fight while the inferior dog takes advantage of the opportunity to obtain benefits. It is not as good as being friendly with the State of Chu.