89 They long that you should disbelieve as they have disbelieved so that you might be on the same level; so take not from among them friends until they flee (their homes) in Allāh’s way. Then if they turn back (to hostility), seize them and kill them wherever you find them, and take no friend nor helper from among them,

90 Except those who join a people between whom and you there is an alliance, or who come to you, their hearts shrinking from fighting you or fighting their own people. And if Allāh had pleased, He would have given them power over you, so that they would have fought you. So if they withdraw from you and fight you not and offer you peace, then Allāh allows you no way against them.

91 You will find others who desire to be secure from you and secure from their own people. Whenever they are made to return to hostility, they are plunged into it. So if they withdraw not from you, nor offer you peace and restrain their hands, then seize them and kill them wherever you find them. And against these We have given you a clear authority.

92 And a believer would not kill a believer except by mistake. And he who kills a believer by mistake 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 be from a tribe between whom and you there is a covenant, the blood-money should be paid to his people along with the freeing of a believing slave; but he who has not the means should fast for two months successively: a penance from Allāh. And Allāh is ever Knowing, Wise.

93 And whoever kills a believer intentionally, his punishment is hell, abiding therein; and Allāh is wroth with him and He has cursed him and prepared for him a grievous chastisement.

94 O you who believe, when you go forth (to fight) in Allāh’s way, make investigation, and say not to any one who offers you salutation, Thou art not a believer, seeking the good of this world’s life. But with Allāh there are abundant gains. You too were such before, then Allāh conferred a benefit on you; so make investigation. Surely Allāh is ever Aware of what you do.