The self-imposed dietary restriction of the Jews 6:143-146
6:143 (He has given you) eight couples, a pair of sheep and a pair of goats. Say, 'Of these, has He forbidden you the males, the females, or what the wombs of the two females contain? Tell me with knowledge, if you are truthful.'
6:144 Then a pair of camels and a pair of cattle. Say, 'Of these, has He forbidden you the males, the females, or what the wombs of the two females contain? Were you witnesses when Allah charged you with this? Who is more harmful than he who, without knowledge, invents a lie about Allah to mislead people? Allah does not guide the harm doers.'
6:145 Say, 'I find nothing in what has been revealed to me that forbids any one to eat of any food except the dead, running blood, and the flesh of swine for these are unclean and that which has been hallowed in its slaughter to other than Allah. But whoever is constrained to eat of any of these, not intending to sin or transgress, then your Lord is Forgiving, the Most Merciful.'
6:146 We forbade the Jews all with undivided hoofs and the fat of sheep and cattle, except what is on their backs and entrails, and what is mixed with their bones. As such We recompensed them for their transgressions. Indeed, We are truthful.