It is not permissible to eat meat slaughtered by kafirs, apart from the People of the Book, i.e., Jews and Christians, whether the kafirs in question are Magians, idolaters, communists or any other kind of kafirs. It is also not permissible to eat anything that has been mixed with their meat, such as soups, sauces, etc. Allah has not permitted us to eat the food of the kuffar apart from the food of the People of the Book, as He says (interpretation of the meaning):
“Made lawful to you this day are At-Tayyibaat [all kinds of Halaal (lawful) foods, which Allah has made lawful (meat of slaughtered eatable animals, milk products, fats, vegetables and fruits)]. The food (slaughtered cattle, eatable animals) of the people of the Scripture (Jews and Christians) is lawful to you and yours is lawful to them” [Al-Ma’idah 5:5]
“Their food” means the meat that they slaughter, as mentioned by Ibn ‘Abbas and others.
With regard to fruits and the like, there is nothing wrong with eating them, because they are not included among the foods that are haram. As for the food of the Muslims, it is permissible for them and for others, if they are true Muslims who worship none but Allah and do not call upon anyone besides Him such as Prophets, awliya’ (“saints”), occupants of graves and others who are worshipped by the kuffar.
With regard to vessels, the Muslims should have vessels separate from those of the kuffar which the latter use for their food, wine, etc. If none are available then the Muslim cooks should wash the vessels that the kuffar use and then put the Muslims’ food in them, because of the report narrated in al-Saheehayn from Abu Tha’labah al-Khushani (may Allah be pleased with him), that he asked the Prophet (peace and blessings of Allah be upon him) about eating from the vessels of the mushrikeen; the Prophet (peace and blessings of Allah be upon him) said to him, “Do not eat from them unless you cannot find anything else, in which case wash them and eat from them.”
May Allah send blessings upon Muhammad and upon his family and companions.