Abu ad-Darda’ reported God’s Messenger as saying, “A believer will continue to go on quickly and well* so long as he does not kill anyone unlawfully, but when he does so he will grow weary.” Abu Dawud transmitted it. *i.e. quick to obey God’s commands and observing well what is due to God and man.
Hadith Referenceمشكوة المصابيح / كتاب القصاص / 3467
Hadith Gradingالألبانی:لم تتمّ دراسته | زبیر علی زئی:إسناده صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «إسناده صحيح، رواه أبو داود (4270)»