The Ruling on the Slaughter of a Mushrik, a Kafir, and One Whose State Is Unknown

Question:
And it is not the case. If one does not know that he will find it, that he should not learn it himself. If one does not know that he will find it, that he should submit to Allah the Exalted. And it is not that it should be

Answer:
It is not permissible to eat the slaughter of a mushrik (one who associates partners with Allah) or a kafir (disbeliever). This is based on the principle that the slaughter of a kafir is not permissible to eat, even if he says "Bismillah" (In the name of Allah) and even if he slaughters in the prescribed manner, due to his lack of eligibility. Only the slaughter of a Muslim and the slaughter of a People of the Book are permissible. The food of those who were given the Scripture is lawful, meaning that which is not the food of Muslims. As for the kafir by a single shari'ah, whether he is a polytheist, an atheist, or a deviant, his slaughter is not permissible because it is an abomination and impure, and it has an effect on the slaughtered animal. It is not permissible to slaughter for them. As for one whose outward appearance is Islam, whose outward appearance is Islam, and we know nothing about him regarding kufr (disbelief) or shirk (associating partners with Allah), the original state is permissibility. The original state for a Muslim is permissibility, unless it is established for us that he is a fasiq (open sinner) or that he is a mushrik, or that he calls for aid from the dead, or that he slaughters for graves. If this is known about him, it is not taken from him. And if he is suspected but nothing is established against him, the original state is permissibility. However, if you leave it off in order to ward off shubhah (doubtful matters) and leave what is doubtful, that is good. Yes. And Allah the Exalted knows best, and may Allah send prayers and peace upon our Prophet Muhammad and upon his family and his Companions.