Muwatta Malik 188
موطأ مالك#188SahihYahya related to me from Malik from Hisham ibn Urwa that his father used to recite behind the imam when the imam did not recite aloud
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMaqtu Sahih
In-book reference: 3:21