And it does not behoove a believer to kill a believer except by mistake, and whoever kills a believer by mistake, he should free a believing slave, and blood-money should be paid to his people unless they remit it as alms; but if he be from a tribe hostile to you and he is a believer, the freeing of a believing slave (suffices), and if he is from a tribe between whom and you there is a convenant, the blood-money should be paid to his people along with the freeing of a believing slave; but he who cannot find (a slave) should fast for two months successively: a penance from Allah, and Allah is Knowing, Wise.

And with those who say, We are Christians, We made a covenant, but they neglected a portion of what they were reminded of, therefore We excited among them enmity and hatred to the day of resurrection; and Allah will inform them of what they did.

And what reason have you that you should not believe in Allah? And the Messenger calls on you that you may believe in your Lord, and indeed He has made a covenant with you if you are believers.