ASSALAM O ALAIKUM!

What is the proof of "Nad e Ali " from Hadith? Shia claims that Nad e Ali was revealed on SYEDINA RASULALLAH SALLALLAHO ALAIHI WASSALAM through Hazrat GEBRAIL ALAIHISSALAM on the occasion of the battle of Khyber,is it true?Two Top Scholars of shia, Ayatollah Fadhlallah and Ayatollah Khui already regarded Nad e Ali as unauthentic.I have read that Hazrat Shah Waliullah Muhaddith dehlavi(rahimahullah) used to recite Nad e Ali,what is the truth.