鷸蚌相爭，漁人得利 [鹬－－争－渔－－－]

Jyutping wat6 pong5 soeng1 zang1 ， jyu4 jan4 dak1 lei6
Pinyin yù bàng xiāng zhēng ， yú rén dé lì

Definitions (Wiktionary)

proverb
When two parties fight, it is always the third one who wins
(syn.) 两败俱伤, 兩敗俱傷

Jyutping neot6 pong5 soeng1 zang1 jyu4 jan4 dak1 lei6
Pinyin yù bàng xiāng zhēng ， yú rén dé lì

Definitions (粵典–words.hk)