Muwatta Malik 19
موطأ مالك#19SahihYahya related to me from Malik from Nafi that Abdullah ibn Umar used to say, "Duluk ash-shams begins from when the sun passes the meridian
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: 1:19