Muwatta Malik 179
موطأ مالك#179SahihYahya related to me from Malik from Nafi that when Abdullah ibn Umar missed anything of the prayer in which the imam recited out loud, he would stand up when the imam had said the taslim and recite what he owed out loud to himself
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMauquf Sahih
In-book reference: 3:12