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Usul al-Kafi
Book 2: The Book of Excellence of Knowledge

Chapter 20
Refer to the Noble Quran or the Prophet (p) for every problem
136. 1. Imam Jafar as-Sadiq (p): Verily, God, the Glorious, the Elevated, has revealed the quintessence of everything in the Noble Quran and by God! He has not omitted anything which His servants may need to the extent that no one can say: Would that it had been revealed in the Noble Quran, because that has already been revealed.
137. 2. Imam Muhammad al-Baqir (p): God, the Most High, has not left out anything which the Community, the Muslims, the followers of Prophet Muhammad (p) need; and explained exact interpretations of the same to His Prophet (p). He has also prescribed specific limits for everything and set signposts for guidance to the destinations and also specified penalties for those who transgress (these limits).
138. 4. Imam Jafar as-Sadiq (p): There is nothing which has not been mentioned in the Book or in Sunnah (the way of Prophet Muhammad (p)).
139. 5. Imam Muhammad al-Baqir (p) addressing a group of believers: Whenever I say something to you, you may ask me about its reference in the Book of God (the Noble Quran).
Then, during his discourse the Imam (p) said that Prophet Muhammad (p) has prohibited people from indulging in gossip like ‘he said this’ and ‘this has been said about him’ and squandering wealth, assets or capital and also from asking too many questions.
A Believer: O son of Prophet Muhammad (p), where is all this in the Book of God?
The Imam (p): Verily, God – the Mighty, the Majestic, says: In most of their secret talks there is no good but if one exhorts to a deed of charity or justice or conciliation between men (secrecy is, however, permissible)…(Q, 4:114).
140. 6. Imam Jafar as-Sadiq (p): There is not a single difference of opinion between two persons whose solution is not given in the Book of God, the Mighty, the Glorious. But their intelligence cannot fathom its depth.
141. 7. Imam Ali (p): O people, verily God, the Glorious, the Elevated, appointed His Prophet for you and sent down His book with true guidance while you were unaware of the Book and the One who revealed it… So, this is the Noble Quran. Ask it whatever you have to ask. It will, however, never speak to you. I shall inform you about it. It contains the knowledge of everything that has passed and also that which is going to happen till the Day of Judgment and is the final word on all matters between you and the solution of all your differences, and if you ask me about it, I shall certainly inform you.
142. 8. Imam Jafar as-Sadiq (p): I am the descendant of Prophet Muhammad (p). I most thoroughly know the Book of God. In it is mentioned the beginning of the Creation and also whatever is going to happen till the Day of Judgment. It contains all information about the heaven and the earth, Paradise and Hell, and the news of all that has happened and all that is going to happen. I know all that as if I were looking at the palm of my hand. God says: …And We revealed the Book to you explaining everything clearly… (Q, 16:89).

143. 10. Imam Musa al-Kazim (p) was asked: Is everything included in the Book of God and Sunnah?
The Imam (p): Yes, everything is included in the Book and the Sunnah.