Their major reference is the book of Ash-shifaa by Qaadiy Iyyadh, where Aliyu was reported to have taught a female Sahaba (companion) a salat that has the most significant portion of salatul-faatihi (Q. Iyyaad.1985, Vol ii. Pp.70-71). This cetain salat ala nabi has a simiar wording of salat al fatihi which is says 'the opener of what was closed and the seal of what came before' In another book titled Al-qaulul badeeah fis salaati alal Habeebi shafee’u (Al-Sakhawiy, 1963, P:44-45), the author too justifies this position.
He quoted the same hadeeth reported by Salamatul Kindiyyi who was first taught the salat by Aliyu bin Abi Dhalib. The author Muhammad bin Abdulrahman bin Muhammad bin Abubakar Al Sakhaawiy Al Shafi’iy (born in Sakhaa, Misra in present day Egypt, in 831 A.H and died in 902 A.H), has proved the source of Salatul Faatihi from the holy prophet (Ibid). Likewise, in a book titled Afdhalul-salawaat alaa sayyidil saadaat written by Yusufun Nabhaaniy, the different riwaayats (versions) of Salatul Faatihi were explicitly analyzed

bn Kathir wrote, in his commentary of Quran, the following Hadith, through the narration of Saeed ibn Mansour, and Yazeed ibn Haroun, and Zaid ibn El-habbab. The three of them narrated it through Nooh ibn Qais, who said that Salamah El-Kindi reported to me that Ali ibn Abu Talib (R.A.A.) used to teach the people this supplication, "O Allah, the Leveler of the leveled (earths), the Creator of the elevated (heavens, skies), and the Disposer of hearts to their natural disposition: the blessed and the wretched, send Your divinely majestic prayers, Your augmenting blessings, and the virtues of Your bounties, upon your servant and Messenger, Mohammed: the opener of what had been closed and the seal of what had gone before; the manifestor of the truth by the truth; and the refuter and destroyer of the surges of falsehood. As he has sturdily undertaken your Commands for Your obedience, prepared for Your pleasure without recoiling or weakening in determination; retainful of Your revelation, preserving Your covenant, resolved in fulfilling Your Commands, until he stroke light (knowledge) for a seeker. The bounties of Allah join the believers with His means. Through him, the hearts are guided after indulgence in seditions (allurements) and sins. He established the elucidating banners, the prominent tenets, and the evident ordinances of Islam. Verily, he is Your reliable trustworthy; the custodian of your Preserved Knowledge; Your witness in the day of judgment; Your Missionary of Grace; and Your Messenger of the Truth for mercy. O Allah, make him room generously in your Aden; and reward him with multitudes of Your good favors: wholesome not embittering, from the gains of Your untied rewards and graceful bestowal. O Allah, make his structures overcome the structures of others, and honor his abode with you and dwelling; and complete, to him, his light and reward him, from the time You raise him, by making him of acceptable testimony, of approved word, of decisive plan, of fair reasoning, and of compelling argument and proof."

This is well known from the words of Ali ibn Abu Talib. It has been commented upon by Abul-Hussein Ahmed ibn Faris El-Luqhawi. Ibn Qutaiba, also, commented upon it in 'The Obscure (Unfamiliar) Hadith': Salamah El-Kindi's narration through Ali ibn Abu Talib (R.A.A.) is discontinued, and the rest of the narrators are authentic. [Tabarani, and Ibn Abu Shaiba].