Muwatta Malik 764
موطأ مالك#764SahihYahya related to me from Malik, from Sadaqa ibn Yasar, that Abdullah ibn Umar said, "By Allah, I would rather do umra before hajj and sacrifice an animal than do umra after hajj in the month of Dhu'l-Hijja
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: 20:60