Imam Muhammad al-Baqir (a.s.) informed regarding the verses – ‘The Faithful Spirit has descended with it, upon your heart that you may be of the warners, in plain Arabic language.’ (Surah Shoara (26): 193-195) that they refer to Wilayat of Ameerul Momineen (a.s.).
Basaaer al-Darajaat part 2 chap 8 trad 5