血債要用血來還 [－债－－－来还]

Jyutping hyut3 zaai3 jiu3 jung6 hyut3 loi4 waan4
Pinyin xuè zhài yào yòng xuè lái huán

Definitions (CC-CEDICT)
  1. A debt of blood must be paid in blood.
  2. Blood calls for blood.