Meat is animal flesh that is eaten as food. Humans have hunted and killed animals for meat since prehistoric times.
Muslim is not allowed to sell or serve or carry or deliver or take money or make accounts or do any thing related to alcohol and pork. Other non Halal meat like beef, mutton, chicken etc is also not allowed to sell to Muslims. Selling it to non Muslims who believe that it is allowed for them, is allowed according to many Maraaji' of Taqleed.
Muslim cashier is not allowed to take money for alcohol or pork.
as salam alaikum
it has been reported that the Messenger of Allah, peace be upon him and his family, said:
عليكم باللحم فإنه ينبت اللحم و من ترك اللحم اربعين يوما ساء خلقه
"You should eat meat because it makes meat grows. Whoever abandon eating meat for forty days will get blameworthy traits".
The hadith has been reported from various sources belonging to different Islamic schools with slight variations of wordings.
Although there is no clear prohibition on veganism, from the above-mentioned hadith and other indications from the Qur'an and Sunna we understand that it is not the ideal diet for a Muslim.
With prayers for your success.
It is narrated that if a person eats forbidden food, their prayers will not be answered for 40 days.
In Mustadrak Safinat al-Bihar, the focus of this narration is specified as food obtained via forbidden means, such as theft or usury, rather than things such as pork or non-zabiha meat, although that would be included in it. This would include any type of food obtained unlawfully, not just meat. The idea here seems to be that a person who lives unlawfully off of other people should not expect to be considered a pious person or close to God even if they are praying and fasting and performing the hajj.
To my understanding, non-zabiha meat was much less of an issue among Muslims in the past, when people tended to raise their own animals or get them from nearby farms, before the mass migration of Muslims to the West and the globalization of commerce. Embezzling things that rightfully belonged to others was much more of an issue, particularly when we look at the way the Umayyad caliphs lived. Of course, it is still an issue, but it is oftentimes easier to focus on the details of how meat is slaughtered rather than the ethical question of how one is earning a living - or, for that matter, the ethics of food production and factory farming.
Anyway, there are a couple factors.
One is if someone is thieving or eating forbidden food intentionally to thumb their nose at the divine, this would naturally distance someone from Allah. Furthermore, there is a sense that food is not just food; rather, one's evil acts involved in obtaining the food taints it.
The other is that even if someone does it accidentally, in practice, the food they are eating has a negative effect on their spiritual side. (That is, there is a cause-and-effect relationship) Many people argue that what one eats does affect people spiritually and thus it is good to be thoughtful about what you eat.
Anyway, it is good to be reasonably careful about, while at the same time it is also important not to become too obsessive, as happens sometimes. If it happens by accident, the best thing to do is to admit one's error to Allah and move on rather than worry about it. Accidents happen!
There is no question of any meat to be Halal without fulfilling all conditions of Halal meat including the condition of a Muslim slaughter. Any animal slaughtered by non Muslim can never be Halal.
Yes, there is no problem with how much the meat is cooked. Some jurists say that it is makruh to eat raw meat, but whether the cooked meat is rare or medium rare, or anything else is fine.
And Allah knows best.
Muslim is not allowed to feed any one pork oe any part of it, even to those who usually eat it.
Feeding non Muslims Non Halal meat is a matter of debate between the scholars. I advise you to refer to your Marja' of Taqleed.
In these mentioned cases, cross-contamination with najasah would make the food najis as well, and therefore haram to eat.
Unless you know that the common process in these restaurants is that they wash the pizza pan, change gloves, wash the knife, and so on. You can ask them these questions, and you can ask that the pizza not be cut, to avoid contamination from najasah.
As for using the same oven, that would not be a problem, because the pizza is put on a pan and then in the oven. If a pan is not used, then this is when there would be a problem.
In regards to french fries, or "chips", not only must the oil itself be halal, it must not have been used for cooking anything non-halal that is najis.
The oil must not be animal based, so it should be vegetable oil. What is cooked in it must not be najis, like meat that has not been Islamically slaughtered. However, if it is not halal to eat, but tahir, then there would not be a problem, like non-halal sea food. This is something you will experience in a fish and chips shop, where they might cook fish that does not have scales, or maybe even crab, in the same oil as the chips, or halal fish. In this case there is no problem, as long as there are no pieces of that food sticking to the food that you are going to eat.
And Allah knows best.
It is not correct.