The Qur'an says:
"
Today, all good food is made lawful for you. The food of the people of the scripture is lawful for you. Also, you may marry the chaste women among the believers, as well as the chaste women among the followers of previous scripture, provided you pay them their due dowries. You shall maintain chastity, not committing adultery, nor taking secret lovers. Anyone who rejects faith, all his work will be in vain, and in the Hereafter he will be with the losers." 5:5
This ayat makes it clear that it's permissible to eat the food of Jews and Christians. So, food that is certified as being slaughtered "kosher" is legal for Muslims to eat. However, most Christians today don't observe any special rules about slaughtering, so it can't be applied. On the day of the Battle of Khaibar the Prophet was invited to eat a lamb that had been prepared by a Jewish woman. The Prophet took one bite and realized the lamb had been poisoned and one of the sahaba died:
Narrated Abu Huraira: When Khaibar was conquered, a roasted poisoned sheep was presented to the Prophet as a gift by the Jews. Sahih Bukhari Book #53, Hadith #394. Also related by Muslim (number 2190), Al-Mustadrak (numbers 4967 and 7090), Abu Dawud (numbers 4508, 4509, and 4512), Bayhaqi (numbers 15784, 15786, 15789, 15791, and 19500), Darami (number 67), Darqutni (number 130), and Imam Ahmad’s collection (numbers 2785 and 3547).
The Prophet also set the example of the permissibility of conducting business transactions with non-Muslims:
Narrated 'Abdur-Rahman bin Abu Bakr: We were one hundred and thirty men sitting with the Prophet. The Prophet said, "Have anyone of you any food with him?" It happened that one man had one Sa of wheat flour (or so) which was turned into dough then. After a while a tall lanky pagan came, driving some sheep. The Prophet asked, 'Will you sell us (a sheep), or give (it to) us as a gift?" The pagan said, "No, but I will sell it " So the Prophet bought from him a sheep which was slaughtered, and then the Prophet ordered that the liver, the kidneys, lungs and heart, etc., of that sheep be roasted. By Allah, none of those one hundred and thirty men but had his share of those things. The Prophet gave to those who were present, and also kept a share for those who were absent He then served that cooked sheep in two big trays and we all ate together our fill; yet there remained a part of it in those two trays which I carried on the camel. Sahih Bukhari Book #65, #294.
Additionally, there is a hadith narrated about a group of people who had recently accepted Islam and sent some meat as a gift to the Prophet. While the Muslims knew it had been slaughtered in a halal manner, they were unsure whether the new converts had known to recite Bismillah while slaughtering:
Narrated 'Aisha: Some people said, "O Allah's Apostle! meat is brought to us by some people and we are not sure whether the name of Allah has been mentioned on it or not (at the time of slaughtering the animals)." Allah's Apostle said (to them), "Mention the name of Allah and eat it." Sahih Bukarhi Book #34, Hadith #273.
From a Shia perspective (
http://www.najaf.org/english/book/5/):
-Since the followers of the past revealed religions (that is, the Jews, the Christians and the Zoroastrians) are ritually pure, many of the problems concerning the status and permissibility of the food are resolved when we live in their midst. It becomes permissible for us as Muslims to eat from their food no matter whether they touched it with their wet hands or not as long as we do not know or are not sure that it consists of what is forbidden to us, like intoxicating drinks. As for meat, fat and their extracts, there are specific rules that will be discussed later on.
-A Muslim is allowed to eat the food prepared by a non-Muslim who is not from Ahlul Kitab [for example, a Hindu or a Buddhist], provided that he does not know or is not sure that the non-Muslim touched the food with wetness; and provided that he does not know or is not sure that the food consists of what is forbidden to him like intoxicating drinks. As for meat, fat and their extracts, there are specific rules that will come later on.
-A Muslim is allowed to eat any food made by a person whose faith and religion is not known to him, no matter whether that person touched it with wetness or did not touch it, provided that he does not know or is not sure that the food consists of what is forbidden to him. As for meat, fat, and their extracts, there are specific rules that will come later on.
t is not necessary for the Muslim to question the person who prepared the food about his beliefs or disbeliefs, or whether or not he had touched the food, even if that inquiry is very convenient and natural for one who wants to ask.
In short, all kinds of food with the exception of meat, fat, and their extracts are permissible for a Muslim, even if he doubts that it might contain something which is forbidden for him to eat or doubts that its cook —whosoever he may be— had touched it with wetness.
-If a Muslim buys or receives meat from a non-Muslim, or from a Muslim who got it from a non-Muslim and did not inquire about its slaughtering according to Islamic laws, such meat is harãm for him. But if the Muslim does not know that the animal was not slaughtered according to Islamic laws, it would not be considered najis, although it is still harãm.
Hope this helps.
Edited by avjar7, 04 April 2008 - 11:01 PM.