Based on the hadith of Ahlulbayt (as), we should abstain from consuming the following parts of animals:
- All reproductive parts (penis, testicles, vagina, vulva, cervix, uterus, cervix)
- Heart (certain parts only, refer to hadith)
- Glands (small organs found all over the body and in the brain)
- Spinal chords
- Anything in the loins
- Bone marrow
- Skin (reference to hadith pending)
The above list is based on the following hadith from Al Kafi:
Imam Reza (as) said: Seven things are prohibited from the sheep – the blood, the two testicles, the penis, the bladder, the glands, the spleen and the gallbladder.
[Al Kafi – V 6 – The Book of Foodstuffs Ch 7 H 1]
Amir Al-Momineen (as) passed by the butchers, so he (as) forbade them from selling seven things from the sheep. He (as) forbade them from selling the blood, the glands, the two ears of the heart (right and left ventricles/chambers), the spleen, the spine, the testicles, and the penis.
[Al Kafi – V 6 – The Book of Foodstuffs Ch 7 H 2]
Abu Abdullah (as) said: Do not eat ten things from the sheep – the excrement, the blood, the spleen, the spine, the thyroid glands, the glands, the penis, the two testicles, the embarrassment (female private part) and the gallbladder.
[Al Kafi – V 6 – The Book of Foodstuffs Ch 7 H 3]
Abu Abdullah (as) said: Do not eat from what happens to be in the camel, and the cow, and the sheep and other than that, from what its meat is permissible – the genitals with what is its apparent and its hidden, the penis, the two testicles, the placenta and it is the place of the birth, the spleen because it is blood, the glands with the veins and (glands of the) brain, that which happens to be in the loins, the gallbladder, the eyeball, the cords (spinal) which happens to be in the brain, and the blood.
[Al Kafi – V 6 – The Book of Foodstuffs Ch 7 H 4]
Amir Al Momineen (as) disliked the two kidneys and said: These two are the reservoir of the urine.
[Al Kafi – V 6 – The Book of Foodstuffs Ch 7 H 6]
Stripping the bones (to eat the marrow):
Abu Hamza made food for us and we were a group. So when we were presented (the meal), he saw a man stripping the bone and taking its marrow, so he shouted at him saying: Do not do it, for I heard Ali Bin Al-Husayn (as) saying: Do not strip the bone (taking out the marrow) for therein is a share for the Jinn, and if you were to do it, there would go away from the house what is better than that’.
[Al Kafi – V 6 – The Book of Foodstuffs Ch 73 H 1]