It is not lawful for a believer to kill another except by mistake. And whoever kills a believer unintentionally must free a believing slave and pay blood-money to the victim’s family—unless they waive it charitably. But if the victim is a believer from a hostile people, then a believing slave must be freed. And if the victim is from a people bound with you in a treaty, then blood-money must be paid to the family along with freeing a believing slave. Those who are unable, let them fast two consecutive months—as a means of repentance to Allah. And Allah is All-Knowing, All-Wise.
— Dr. Mustafa Khattab, the Clear Quran
And never is it for a believer to kill a believer except by mistake. And whoever kills a believer by mistake - then the freeing of a believing slave and a compensation payment [diyah] presented to his [i.e., the deceased's] family [is required], unless they give [up their right as] charity. But if he [i.e., the deceased] was from a people at war with you and he was a believer - then [only] the freeing of a believing slave; and if he was from a people with whom you have a treaty - then a compensation payment presented to his family and the freeing of a believing slave. And whoever does not find [one or cannot afford to buy one] - then [instead], a fast for two months consecutively,1 [seeking] acceptance of repentance from Allah.2 And Allah is ever Knowing and Wise.
— Saheeh International
And whoever kills a believer intentionally, their reward will be Hell—where they will stay indefinitely.1 Allah will be displeased with them, condemn them, and will prepare for them a tremendous punishment.
— Dr. Mustafa Khattab, the Clear Quran
But whoever kills a believer intentionally - his recompense is Hell, wherein he will abide eternally, and Allah has become angry with him and has cursed him and has prepared for him a great punishment.
— Saheeh International
O believers! When you struggle in the cause of Allah, be sure of who you fight. And do not say to those who offer you ˹greetings of˺ peace, “You are no believer!”—seeking a fleeting worldly gain.1 Instead, Allah has infinite bounties ˹in store˺. You were initially like them then Allah blessed you ˹with Islam˺. So be sure! Indeed, Allah is All-Aware of what you do.
— Dr. Mustafa Khattab, the Clear Quran
O you who have believed, when you go forth [to fight] in the cause of Allah, investigate; and do not say to one who gives you [a greeting of] peace, "You are not a believer,"1 aspiring for the goods of worldly life; for with Allah are many acquisitions. You [yourselves] were like that before; then Allah conferred His favor [i.e., guidance] upon you, so investigate. Indeed Allah is ever, of what you do, Aware.
— Saheeh International