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

Chapter44
Two kinds of knowledge

388. 2. Imam Jafar as-Sadiq (p): With God, there are two kinds of knowledge; one, which He has not revealed to anyone, and the other, which He has imparted to His Angels and Prophets. The knowledge, which has been given to the Angels and the Prophets, has also been given to us.