What did the Ahlul Bayt (A.S) say about Abu Bakr & Umar?

Narrated al-Husain bin Mohammad al-Ashari, from Mualla bin Mohammad, from al-Washa, from Aban bin Usman, from Abd al-Rahman bin Abi Abdillah who said,
I said to Abi Abdillah Imam Sadiq (A.S), "Allah blessed us with the recognition of His monotheism (Tawheed), then He blessed us with the belief in Muhammad's (P.B.U.H&H.P) message, then He distinguished us with your love the Ahlul Bayt (A.S). We love you (Tawallah) and dissociate (Tabarrah) from your enemy. We want that so that we may save ourselves from the Fire."
Then, the man became weak, and began to weep. So Imam as-Sadiq (A.S) said, "Ask me, for by Allah, you will not ask me about a thing except that I will inform you about it."
The man said, "Inform me about the two men (referring to Abu Bakr & Umar)."
The Imam (A.S) replied, "They oppressed our rights, which are in the Book of Allah, and they prevented Fatima (S.A) from her inheritance from her father. Their oppression has continued until today" - then he pointed to his back - "and they have hid the Book of Allah behind their backs."
[Source: al-Kafi, Vol. 8. Pg. 102]