Al-Kāfi - Volume 6 > Comprehensive Chapter on Animals that are not Edible
Hadith #4

عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ عَمْرِو بْنِ عُثْمَانَ عَنِ الْحُسَيْنِ بْنِ خَالِدٍ قَالَ قُلْتُ لِأَبِي الْحَسَنِ يَعْنِي مُوسَى بْنَ جَعْفَرٍ ( عليه السلام ) أَ يَحِلُّ أَكْلُ لَحْمِ الْفِيلِ فَقَالَ لَا قُلْتُ وَ لِمَ قَالَ ( عليه السلام ) لِأَنَّهُ مَثُلَةٌ وَ قَدْ حَرَّمَ اللَّهُ عَزَّ وَ جَلَّ الْأَمْسَاخَ وَ لَحْمَ مَا مُثِّلَ بِهِ فِي صُوَرِهَا .

4. Ali ibn Ibrahim has narrated from his father from ‘Amr ibn ‘ Uthman from al-Husayn ibn Khalid who has said the following: “I once asked abu al-Hassan, Musa ibn Ja‘far, ‘Alayhi al-Salam, about the flesh of elephants. He (the Imam) said, ‘No, it is not lawful for food.’ I then asked, ‘Why is it so?’ He (the Imam) said, ‘It has deformities and Allah, most Majestic, most Glorious, has made what is metamorphosed unlawful for food as well as the flesh of what is deformed in its shape.”’