Muwatta Malik 530
موطأ مالك#530SahihYahya related to me from Malik that Ibn Shihab said, "Walking behind the bier is in contradiction to the sunna
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMaqtu Sahih
In-book reference: 16:11