وَلَا تَأْكُلُوا مِمَّا لَمْ يُذْكَرِ اسْمُ اللَّهِ عَلَيْهِ وَإِنَّهُ لَفِسْقٌ ۗ وَإِنَّ الشَّيَاطِينَ لَيُوحُونَ إِلَىٰ أَوْلِيَائِهِمْ لِيُجَادِلُوكُمْ ۖ وَإِنْ أَطَعْتُمُوهُمْ إِنَّكُمْ لَمُشْرِكُونَ (121)
(6:121) Do not eat of (the animal) over which the name of Allah has not been pronounced (at the time of its slaughtering), for that is a transgression. And behold, the evil ones do inspire doubts and objections into the hearts of their friends so that they dispute with you; *86 but if you obey them, you will surely yourselves turn into those who associate others with Allah in His divinity. *87
*86). It has been reported in a tradition transmitted by 'Abd Allah b. 'Abbas that the Jewish religious scholars used to prompt the ignorant people of Arabia to address many enquiries to the Prophet (peace be on him) so as to discredit him. One of the questions they taught them to ask was: 'Why is it that an animal killed by (the act of) God should be deemed prohibited, while one killed by us is considered lawful?'This is a common example of the warped mentality of the People of the Book. They strained their minds to contrive such questions so as to create doubts in people's minds and to provide them with intellectual weapons in their fight against the Truth.
*87). To acknowledge the overlordship of God, yet to follow at the same time the orders and ways of those who have turned away from Him, amounts to associating others with God in His divinity. True belief in the unity of God consists in orienting one's entire life to the obedience and service of God. Those who believe that any other being besides God is to he acknowledged in principle as having an independent claim on man's unreserved obedience should know that such acknowledgement amounts to associating others with God in His divinity at the level of belief. On the other hand, if they actually do obey those who, in sheer disregard of God's guidance and injunctions, arrogate to themselves the right to declare according to their whims certain things to be lawful and others to be unlawful, and to bid and forbid people as they please, this amounts to associating others with God in His divinity at the level of action.