Usul al-Kafi
Book 4:
The Book of Divine Proof

Chapter 11
The treasurers of God

327. 1. Imam Jafar as-Sadiq (p): We are the bearers of authority from God and we are the treasurers of the knowledge of God and the centres of revelations from God
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328. 2. Imam Muhammad al-Baqir (p): By God! We are the treasurers of God on earth and in the heavens; not of gold and silver but of His knowledge.

329. 5. Imam Jafar as-Sadiq (p): Verily, God is One with the Oneness of Absolute Unity and totally independent in establishing His order. He brought the creations into existence and established that order. We are the proofs of (the existence of) God among His servants and we are the custodians of His knowledge and are firmly established in this status.