[1/35] al-Kafi: Ali from Muhammad b. Isa b. Ubayd from Yunus from Abd al-Rahman b. al-Hajjaj who said: Abu Abdillah عليه السلام said to me: beware of two qualities – due to them have been destroyed those who have been destroyed: beware of giving Fatwa to the people based on your own opinion or to take as part of your Diin that which you you do not know (are not certain of).

[1/35] الكافي: علي، عن محمد بن عيسى، عن يونس، عن عبدالرحمن بن الحجاج قال: قال لي أبوعبدالله عليه السلام إياك وخصلتين ففيهما هلك من هلك: إياك أن تفتي الناس برأيك أو تدين بما لا تعلم