Muwatta Malik 407
موطأ مالك#407SahihYahya related to me from Malik from Nafi that Abdullah ibn Umar passed by a man who was praying and said, "Peace be upon you," and the man replied to him. Abdullah ibn Umar returned to him and said, "When someone says, 'Peace be upon you' to you while you are praying do not reply, but give a signal with your hand
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: 9:82