[2/-] al-Kafi: Ali from his father AND Muhammad b. Ismail from al-Fadhl b. Shadhan all together from Ibn Abi Umayr and Safwan b. Yahya all together from Abd al-Rahman b. al-Hajjaj who said: I asked Aba al-Hasan عليه السلام about two men who kill game [together] while they are in Ihram – will the atonement be shared between them or will it be incumbent on each one of them individually? He said: Rather it will be on each one of them to atone individually for the hunted animal, I said: one of our fellows asked me about that but I did not know what would be upon him, so he said: if you encounter the like of this [such scenarios] and do not know what to do then upon you is acting by precaution until when you ask about it and know [the exact answer]. Comments
al-Majlisi says: Ihtiyat (precaution) here means not giving an answer one way or another (if you are the one asked) and not acting one way or the other (if you are the one asking) until you ask the Imam himself and obtain full knowledge.
I say: it is also possible that the Imam means by Ihtiyat here that you should answer or act in such a way that you bear the utmost burden possible, so in this case you would rule both of them to pay Kaffara individually for hunting instead of sharing the cost between themselves. As in Ihtiyat is to cover all bases and do more that what could be required so as to be on the safe side.
[-/2] الكافي: علي، عن أبيه، ومحمد بن إسماعيل، عن الفضل بن شاذان جميعا، عن ابن أبي عمير وصفوان بن يحيى جميعا، عن عبدالرحمن بن الحجاج قال: سألت أبا الحسن عليه السلام عن رجلين أصابا صيدا وهما محرمان الجزاء بينهما أو على كل واحد منهما جزاء؟ فقال: لابل عليهما أن يجزي كل واحد منهما الصيد، قلت: إن بعض أصحابنا سألني عن ذلك فلم أدر ما عليه، فقال: إذا أصبتم مثل هذا فلم تدروا فعليكم بالاحتياط حتى تسألوا عنه فتعلموا