«إذا حكمتم فاعدلوا وإذا قتلتم فأحسنوا فإن الله محسن يحب المحسنين»
The Prophet (peace and blessings be upon him) said:
"When you judge, act with justice and fairness; and when you take a life (in retribution, slaughter and the like), do it in the best manner, for indeed Allah Almighty is doer of good and loves those who do good."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 494