Correct
冤有头，债有主
/ yuān yǒu tóu, zhài yǒu zhǔ /
Strokes
Definition
for every grievance someone is responsible, for every debt there is a debtor (idiom)/when settling disputes one should not involve third parties
Example
Definition
every injustice has its perpetrator, every debt has its debtor; reprisal for a wrong should be directed at the perpetrator; avenge a wrong on the wrongdoer