The narrations concerning Mushaf Fatimah are sound and...
The narrations concerning Mushaf Fatimah are sound and reliable by any of the three methods we have noted. If we want to use the third method, every single Shi'a scholar has acknowledged the authenticity of the narrations concerning this Mushaf , and we haven't found a single dissenting scholar (in this regard). This matter strengthens the determination of authenticity using the second method (multiplicity of chains).
We should mention that some have said, “Is it possible that Jibra'il(a.s) would descend unto Lady Fatimah(a.s) and impart matters to her, and that 'Ali(a.s) could hear this and write it down?” Others say, “But 'Ali(a.s) is superior in virtues to Fatimah(a.s); he(a.s) seems worthy of such a revelation.” We will answer these reproaches.
For the time being, it suffices to quote 'Allamah Muhsin Amin who said, “it is neither improbable nor is there room for doubt to believe that Jibra'il(a.s) would speak to Zahra(a.s) and that 'Ali(a.s) could hear it. It's recorded in a book by the name of Mushaf Fatimah . What's more, the reliable companions of the Imams(a.s) have narrated such a thing.
To those who doubt this, or think it to be improbable, or who think it to be exaggerated or lacking impartiality, I say, 'Do you doubt the power of Allah the most high? Is Zahra(a.s)[^2], who is of the very essence of the Prophet(s.a.w) not worthy of this grace? Do you doubt the soundness of a narration despite the fact that they were uttered from the very Imams of guidance who were the issue of this noble lady and are totally reliable?
Given the fact that this same honor was bestowed on Aasif bin Barkhiyaa and also Sulaymaan(a.s), and they certainly not more dear to Allah than the family of Mohammad(a.s)![^3] The reliability of the hadith concerning the Mushaf Fatimah can also be demonstrated by the first method.
For example, Kulayni in Al-Kafi considered the hadith and narrations about this book to be acceptable (صحيح).[^4] In one of these hadiths, Imam al-Sadiq(a.s) says, “Fatimah(a.s) lasted 75 days after the departure of the Prophet of Allah(s.a.w). Because of her father's (death), she suffered a profound sadness. Jibra'il(a.s) alighted to her in order to abate her grieving and to give her something pleasing.
He informed her about her father's (state in heaven) and his (exalted) rank and told her what would happen to her descendents.