Muwatta Malik 542
موطأ مالك#542SahihYahya related to me from Malik from Nafi that Abdullah ibn Umar said, "The prayer over Umar ibn al-Khattab was done in the mosque
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: 16:23