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Surah 2. Al-Baqara
Ayah 172 - 173
172 يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ كُلُوا۟ مِن طَيِّبَـٰتِ مَا رَزَقْنَـٰكُمْ وَٱشْكُرُوا۟ لِلَّهِ إِن كُنتُمْ إِيَّاهُ تَعْبُدُونَ
173 إِنَّمَا حَرَّمَ عَلَيْكُمُ ٱلْمَيْتَةَ وَٱلدَّمَ وَلَحْمَ ٱلْخِنزِيرِ وَمَآ أُهِلَّ بِهِۦ لِغَيْرِ ٱللَّهِ ۖ فَمَنِ ٱضْطُرَّ غَيْرَ بَاغٍ وَلَا عَادٍ فَلَآ إِثْمَ عَلَيْهِ ۚ إِنَّ ٱللَّهَ غَفُورٌ رَّحِيمٌ
[172-173] O Believers, if you are true worshippers of Allah alone, eat without hesitation of the good and clean things wherewith We have provided you and be grateful to Allah.170 Allah has only forbidden you to eat what dies of itself, and blood and swine flesh and what has been consecrated to any other name than of Allah.171 But one will incur no sin if, forced by absolute necessity, he eats of any of these forbidden things, provided he has no intention of transgressing the law and does not take more than what is absolutely indispensable: for Allah is very Forgiving and very Merciful.172
170The Believers are enjoined to break all sorts of unnecessary, improper and unlawful restrictions imposed by the pundits, the priests, the rabbis, the clergies, the forefathers, etc.
For if they really believe in Allah, as they profess, they should abstain from eating only what Allah has forbidden and eat, without any hesitation, only what Allah has declared lawful.
According to a Tradition of the Holy Prophet, "One who offers the Salat in the way we offer, turns his face towards the giblah to which we turn our face, and eats what we have slaughtered, is a Muslim." Therefore if one has any scruples regarding the eating of those things which Allah has declared lawful, he has not as yet become a true Muslim, even if he offers the Salat, turning his face towards the Ka`bah. He should give up the prejudices and superstitions of ignorance if he really and sincerely has become a Muslim. For the very observance of old traditions and customs is a proof that he is still imbued with the poison of ignorance.
171This applies both to the flesh of the animal which is slaughtered in the name of any other than Allah and to the food which is offered as a vow to any other than Allah. As a matter of fact, everything whether animal, corn, or another eatable:, actually belongs to Allah and is given by Him; therefore it should be offered as charity, or as vow, only in His name as a mark of gratitude to Him. If it is offered in any other name it means that one regards it also, instead of Allah, or along with Allah, as supreme, and the bestower of favours and blessings.
172In this verse, permission for the use of an unclean thing has been given on three conditions: (1) It must be really a case of extremity. For instance, if one is dying of hunger or thirst or if one's life is in danger because of some disease and there is nothing available except an unclean thing, one is permitted to take it. (2) One should not cherish any desire in one's heart to break the law of Allah. (3) One should not take even a bit more than what is absolutely necessary. For example, if in a certain case, a few bits or drops of an unclean thing can save life, then nothing more than this absolute minimum should be taken.