Wilayat-e-Ali in Prayer of Muhammad (PBUH)

وَلَا تَجْهَرْ بِصَلَاتِكَ وَلَا تُخَافِتْ بِهَا وَابْتَغِ بَيْنَ ذَٰلِكَ سَبِيلًا١٧:١١٠

"Neither speak thy Prayer aloud, nor speak it in a low tone, but seek a middle course between." [17:110]

Jabir ibn Abdullah Ansari asks Imam Muhammad Baqir (as) regarding this verse of the Holy Quran. Imam Baqir (as) replied saying:

ولا تجهر بولایة علی 

“Do not say the Wilayat of Imam Ali (as) in Namaz alound. But don’t hide it from Ali (as). Recite it in a middle tone until I give you the permission to recite/declare it openly. This permission was granted on the day of Ghadeer-e-Khum.”

[Ref: Tafseere Noor-us-Saqlain Vol. 3 Pg. 235, Tafseer-e -Ayyashi, Tafseer-e-Saafi, Tafseer-e-Burhaan]