兔子不吃窝边草

A villain doesn't harm his neighbours.

tù zi bù chī wō biān cǎo ㄊㄨˋ ㄗㄧ ㄅㄨˋ ㄔㄧ ㄨㄛ ㄅㄧㄢ ㄘㄠˇ