{ And do not kill the soul that Allah has forbidden, except with just cause; whoever is killed wrongly, we have given authority to his heir; but let one not go to extremes in killing, for indeed he will be aided } Al-israa 33

{ And do not kill the soul that Allah has forbidden, except with just cause } ; Truly we swear by Allah, we know of nothing that makes the blood of a Muslim man lawful except one of three things: a man who kills intentionally – retaliation is due him; someone who adulterates after being married – he is to be stoned; and someone who disbelieves after being in Islam – he is to be killed.