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

Chapter 16
The commanders of the faith

338. 2. Imam Ali ar-Reza (p) commenting on the verse: Or do they envy people for what God has given them of His bounty, (Q, 4:54)
The Imam (p): We are the ones who are envied.

339. 5. Imam Muhammad al-Baqir (p) was asked to comment on the verse: Surely, we gave the progeny of Ibrahim, the Book, and the Wisdom, and We gave them a mighty kingdom. (Q, 4:54)
The Imam (p): God has appointed the Apostles, the Prophets and the Imams from the progeny of Prophet Ibrahim (Abraham) (p). Is it not strange that people accept the honour bestowed upon the progeny of Prophet Ibrahim (p), but deny the same for the progeny of Prophet Muhammad (p)? ...