An-Nisaa 4:92 وما كان لمومن ان يقتل مومنا الا خطا ومن قتل مومنا خطا فتحرير رقبة مومنة ودية مسلمة الى اهله الا ان يصدقوا فان كان من قوم عدو لكم وهو مومن فتحرير رقبة مومنة وان كان من قوم بينكم وبينهم ميثاق فدية مسلمة الى اهله وتحرير رقبة مومنة فمن لم يجد فصيام شهرين متتابعين توبة من الله وكان الله عليما حكيما ٩٢

It is not for a believer to slay another believer unless by mistake.¹ And he who has slain a believer by mistake, his atonement is to set free from bondage a believing person² and to pay blood-money to his heirs,³ unless they forgo it by way of charity. And if the slain belonged to a hostile people, but was a believer, then the atonement is to set free from bondage a believing person.And if the slain belonged to a (non-Muslim) people with whom you have a covenant, then the atonement is to pay the blood-money to his heirs, and to set free from bondage a believing person.⁴ But he who cannot (free a slave) should fast for two consecutive months.⁵ This is the penance ordained by Allah.⁶ Allah is All-Knowing, All-Wise.