河水不犯井水 [ㄏㄜˊ ㄕㄨㄟˇ ㄅㄨˋ ㄈㄢˋ ㄐㄧㄥˇ ㄕㄨㄟˇ; he2 shui3 bu4 fan4 jing3 shui3] lit. river water does not interfere with well water (idiom); Do not interfere with one another. Mind your own business. ◄ ►