Muwatta Malik 361
موطأ مالك#361SahihYahya related to me from Malik from Ibn Shihab that Ubaydullah ibn Abdullah ibn Utba said, "I visited Umar ibn al-Khattab just before noon and found him praying a voluntary prayer. So I stood behind him, but he pulled me nearer and put me next to him, on his right hand side, and then Yarfa came and I moved back and we formed a row behind him
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: 9:36