When it is said to them: "Follow what God hath revealed:" They say: "Nay! we shall follow the ways of our fathers." What! even though their fathers Were void of wisdom and guidance? (2:170)

O ye who believe! Violate not the sanctity of the symbols of God, nor of the sacred month, nor of the animals brought for sacrifice, nor the garlands that mark out such animals, nor the people resorting to the sacred house, seeking of the bounty and good pleasure of their Lord. But when ye are clear of the sacred precincts and of pilgrim garb, ye may hunt and let not the hatred of some people in (once) shutting you out of the Sacred Mosque lead you to transgression (and hostility on your part). Help ye one another in righteousness and piety, but help ye not one another in sin and rancour: fear God: for God is strict in punishment. (5:3)

O ye who believe! Ask not questions about things which, if made plain to you, may cause you trouble. But if ye ask about things when the Qur'an is being revealed, they will be made plain to you, God will forgive those: for God is Oft-forgiving, Most Forbearing. (5:104)

And they say that such and such cattle and crops are taboo, and none should eat of them except those whom - so they say - We wish; further, there are cattle forbidden to yoke or burden, and cattle on which, (at slaughter), the name of God is not pronounced; - inventions against God's name: soon will He requite them for their inventions. (6:138)