Basis regarding permission and prohibition

Eat only that over which the name of God has been pronounced, if you truly believe in His commands.

And why should you not eat of that over which the name of God has been pronounced, when He has made it distinctly clear what is forbidden, unless you are constrained to do so. Surely many (men) mislead others into following their vain desires through lack of knowledge. Your Lord certainly knows the transgressors.

Discard both the visible and invisible sin. For those who sin will be punished for what they have done.

Do not eat of that over which God's name has not been pronounced, for that would amount to exceeding the limits of law. Certainly the devils inspire their proteges to dispute with you: If you obey them, you will surely become an idolater.