兔子不吃窩邊草 [－－－－窝边－]

Jyutping tou3 zi2 bat1 hek3 wo1 bin1 cou2
Pinyin tù zi bù chī wō biān cǎo

Definitions (CC-CEDICT)
  1. A rabbit doesn't eat the grass by its own burrow (idiom); One shouldn't do anything to harm one's neighbors.