✅ Answer: Pay attention to the following narrations:

1⃣عن أبی الحسن قال: حَرُمَ مِنَ الشَّاةِ سَبْعَةُ أَشْیَاءَ الدَّمُ و الْخُصْیَتَان و الْقَضِیبُ و الْمَثَانَةُ و الْغُدَدُ و الطِّحَالُ و الْمَرَارَة

📚 Kafi, Vol. 6, p. 253

Imam Kazim, peace be upon him, said: Seven things from a sheep are forbidden: blood, testicles, penis, bladder, glands, spleen, and gallbladder!

2⃣أبی یحیی الواسطی رفعه قال: مَرَّ أَمِیرالْمُؤْمِنِین بِالْقَصَّابِینَ فَنَهَاهُمْ عَنْ بَیْعِ سَبْعَةِ أَشْیَاء مِنَ الشَّاةِ نَهَاهُمْ عَنْ بَیْعِ الدَّمِ و الْغُدَدِ و آذَانِ الْفُؤَادِ و الطِّحَالِ و النُّخَاع و الْخُصَی و الْقَضِیب

📚 Kafi, Vol. 6, p. 253

Amir al-Mu’minin, peace be upon him, passed by butchers and forbade them from selling seven things from a sheep: he prohibited them from selling blood, glands, heart membranes, spleen, spinal cord, testicles, and penis!

3⃣ Ismail ibn Marrar narrated from them, saying: What is not eaten from camels, cows, sheep, and other animals whose meat is lawful includes the private parts—both external and internal—the penis, testicles, placenta (the place of the fetus), spleen because it is blood, glands with veins, spinal cord, gallbladder, eye pupil, the bead in the brain, and blood.

Ismail narrated from the Ahl al-Bayt, peace be upon them, that they said: From what exists in camels, cows, sheep, and other lawful-meat animals, these are not eaten: the private parts with what is external and internal, the penis, testicles, placenta which is the womb, spleen because it is blood, glands with veins, the marrow in the spine (i.e., spinal cord), gallbladder, eye pupil, the bead in the brain, and blood.

📚 Kafi, Vol. 6, p. 254

4⃣عن أبی عبداللَّه قال: لا یُؤْکَلُ مِنَ الشَّاةِ عَشَرَةُ أَشْیَاءَ الْفَرْثُ و الدَّمُ و الطِّحَالُ و النُّخَاعُ و الْغُدَدُ وَ الْقَضِیبُ وَ الْأُنْثَیَیْنِ وَ الرَّحِمُ وَ الْحَیَاءُ وَ الْأَوْدَاجُ أَوْ قَالَ الْعُرُوق

📚 Khasal, p. 434

Imam Sadiq, peace be upon him, said: Ten parts of a sheep are not eaten: dung, blood, spleen, spinal cord, glands, penis, testicles, womb, private parts, and jugular veins—or he said: veins!

5⃣عن مِسْمَعٍ عَنْ أَبِی عَبْداللَّهِ قَالَ: قَالَ أَمِیرُ الْمُؤْمِنِینَ إِذَا اشْتَرَی أَحَدُکُمُ اللَّحْمَ فَلْیُخْرِجْ مِنْهُ الْغُدَدَ فَإِنَّهُ یُحَرِّکُ عِرْقَ الْجُذَامِ.

📚 Kafi, Vol. 6, p. 254

Amir al-Mu’minin, peace be upon him, said: When one of you buys meat, remove the glands from it, for they stimulate the vein of leprosy!

6⃣عن زید الشحام عن أَبی عبداللَّه فِی شَاةٍ تَشْرَبُ خَمْراً حَتَّی سَکِرَتْ ثُمَّ ذُبِحَتْ عَلَی تِلْکَ الْحَالِ قَالَ لَا یُؤْکَلُ مَا فِی بَطْنِهَا

📚 Kafi, Vol. 6, p. 251

Imam Sadiq, peace be upon him, said regarding a sheep that drinks wine until it becomes intoxicated: If it is slaughtered in that state, what is in its belly is not to be eaten!

7⃣عَنْ أَبِی جَعْفَرٍ فِی شَاةٍ شَرِبَتْ بَوْلًا ثُمَّ ذُبِحَتْ قَالَ فَقَالَ یُغْسَلُ مَا فِی جَوْفِهَا ثُمَّ لَا بَأْسَ بِهِ وَ کَذَلِکَ إِذَا اعْتَلَفَتْ بِالْعَذِرَةِ مَا لَمْ تَکُنْ جَلَّالَةً وَ الْجَلَّالَةُ الَّتِی یَکُونُ ذَلِکَ غِذَاؤُهَا

📚 Kafi, Vol. 6, p. 251

Imam Baqir, peace be upon him, said regarding a sheep that drinks urine and is then slaughtered: What is inside it is washed and there is no problem. Likewise, if it eats impurity, as long as it is not a jallala—and a jallala is one whose food is exclusively impurity!

8⃣ Aban said, then Abu Abdullah said: Ten things are disliked from a slaughtered animal, including the spleen, testicles, spinal cord, blood, skin, bones, horns, hooves, glands, and penis.

📚 Ilal al-Shara’i, Vol. 2, p. 562

In a narration, Aban ibn Uthman says: Imam Sadiq, peace be upon him, said: Ten things from a slaughtered animal are disliked, among them the spleen, testicles, spinal cord, blood, skin, bones, horns, hooves, glands, and penis.

9⃣ From Abu Abdullah, he said: Ten things are forbidden from a slaughtered animal, while ten things are permissible from a dead animal. As for what is forbidden from the slaughtered animal, it is blood, dung, glands, spleen, penis, testicles, womb, hooves, horns, and hair.

📚 Mahasin, Vol. 2, p. 471

Imam Sadiq, peace be upon him, said in a narration: Ten things from a slaughtered animal are forbidden... What is forbidden from the slaughtered animal includes blood, dung, glands, spleen, penis, testicles, womb, hooves, horns, and hair...

✅ Based on the above narrations and others, there is no prohibition on eating the intestines of a lawful-meat animal, unless the animal is given wine to drink and slaughtered while intoxicated, in which case its internal parts such as the intestines and tripe are not to be eaten. If the animal consumes urine or excrement and is slaughtered in that state, its internal parts like the intestines and tripe can be eaten after washing.