Reference from Al-Quran:

5-3. You are forbidden to eat the meat of any animal that dies by itself (dead body), blood, the flesh of swine (pork) and that on which any name other than Allah has been invoked; also that which is strangled to death , killed by a violent blow, killed by a headlong fall and of those beaten or gored to death; and that which has been partly eaten by a wild animal unless you are able to slaughter it before its death; also that which is sacrificed on altars or is divided by raffling of arrows. All these are sinful acts. Today the unbelievers have given up all their hope of vanquishing your religion. Have no fear of them, fear Me. Today I have perfected your religion for you, completed my favour upon you and approved Al-Islam as your religion (way of life for you). Anyone who is compelled by hunger to eat what is forbidden, not intending to commit sin, will find Allah Forgiving, Merciful.

23-53. Yet people have divided themselves into factions and each faction rejoices in its own doctrines

6-159. Verily, those who divide their religion and break up into sects, you have no concern in them in the least. Their affair is only with Allâh, Who then will tell them what they used to do.