Muwatta Malik 431
موطأ مالك#431SahihYahya related to me from Malik that he had heard that Abu Bakr and Umar used to do that
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: 10:4