Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
quran:26:130

And when you strike, you strike as tyrants.  

And when you assault, to smite or slay, you assault like tyrants, mercilessly!
القرآن:٢٦:١٣٠

وَإِذَا بَطَشْتُمْ بَطَشْتُمْ جَبَّارِينَ  

{وإذا بطشتم} بضرب أو قتل {بطشتم جبارين} من غير رأفة.