Muwatta Malik 540
موطأ مالك#540SahihYahya related to me from Malik from Nafi that Abdullah ibn Umar said, "The prayer for a dead person can be done after asr and subh if these have been prayed at their times
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: 16:21