[٣٧٢/٢] الكافي: عدة من أصحابنا، عن أحمد بن محمد بن خالد، عن أبيه، عن ابن أبي عمير، عن محمد بن حمران، عن أبي عبيدة الحذاء قال: قال أبوجعفر عليه السلام: يا زياد إياك والخصومات فإنها تورث الشك وتهبط العمل وتردي صاحبها وعسى أن يتكلم بالشئ فلا يغفر له إنه كان فيما مضى قوم تركوا علم ما وكلوا به وطلبوا علم ما كفوه حتى انتهى كلامهم إلى الله فتحيروا حتى ان كان الرجل ليدعي من بين يديه فيجيب من خلفه ويدعي من خلفه فيجيب من بين يديه
2. [2/372] al-Kafi: A number of our companions from Ahmad b. Muhammad b. Khalid from his father from Ibn Abi Umayr from Muhammad b. Humran from Abi Ubayda al-Hadhdha who said: Abu Ja’far عليه السلام said: O Ziyad - beware of argumentation because it creates doubt, nullifies deeds and degrades its initiator, and it may happen that a man speaks something for which he is never forgiven. There was in days gone by a people who abandoned studying what they were entrusted and sought the knowledge of what they were asked to refrain from, until their talks turned to Allah and they became confused, so much so that a man would be called from in front of him but he would answer the one who is behind him and he would be called from behind and would answer the one in front. 