Al-Kāfi
Hadith 768مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنْ يَعْقُوبَ بْنِ يَزِيدَ عَنْ أَحْمَدَ بْنِ الْمُبَارَكِ عَنْ صَالِحِ بْنِ أَعْيَنَ عَنِ الْوَشَّاءِ عَنْ أَيُّوبَ بْنِ أَعْيَنَ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) قَالَ قُلْتُ لَهُ جُعِلْتُ فِدَاكَ مَا تَقُولُ فِي حَيَّةٍ ابْتَلَعَتْ سَمَكَةً ثُمَّ طَرَحَتْهَا وَ هِيَ حَيَّةٌ تَضْطَرِبُ أَ فَآكُلُهَا فَقَالَ ( عليه السلام ) إِنْ كَانَتْ فُلُوسُهَا قَدْ تَسَلَّخَتْ فَلَا تَأْكُلْهَا وَ إِنْ كَانَتْ لَمْ تَتَسَلَّخْ فَكُلْهَا .
16. Muhammad ibn Yahya has narrated, from Ahmad ibn Muhammad, from Ya‘qub ibn Yazid from Ahmad ibn al-Mubarak, from Salih ibn ‘A‘yan from al-Washsha’ from Ayyub ibn ‘A‘yan who has said the following: “I once said to abu ‘Abd Allah (a.s.), I pray to Allah to keep my soul in service for your cause. What do you say about a snake that has swallowed a fish then has thrown it out and it still is alive and struggling; if it can be used for food. He (the Imam) said, ‘If its scales are peeled off then do not use it for food; but if it is not peeled off you can use it for food.’”