Al-Kāfi - Volume 6 > Comprehensive Chapter on Animals that are not Edible
Hadith #11

مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ سِنَانٍ عَنْ أَبِي الْجَارُودِ عَنْ أَبِي جَعْفَرٍ ( عليه السلام ) قَالَ سَمِعْتُهُ يَقُولُ إِنَّ الْمُسْلِمِينَ كَانُوا أَجْهَدُوا فِي خَيْبَرَ فَأَسْرَعَ الْمُسْلِمُونَ فِي دَوَابِّهِمْ فَأَمَرَهُمْ رَسُولُ اللَّهِ ( صلى الله عليه وآله ) بِإِكْفَاءِ الْقُدُورِ وَ لَمْ يَقُلْ إِنَّهَا حَرَامٌ وَ كَانَ ذَلِكَ إِبْقَاءً عَلَى الدَّوَابِّ .

11. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn Sinan from abu al-Jarud who has said the following: “I once heard abu Ja’far, Alayhi al-Salam, saying, ’Muslims during the days of Khaybar faced difficulties and they rushed their stumpers. The Messenger of Allah, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, commanded that the cooking pots must be emptied (of cooking donkey flesh) and did not say it is unlawful for food. It was to preserve stumpers.’”