Muwatta Malik · #530
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، أَنَّهُ قَالَ الْمَشْىُ خَلْفَ الْجَنَازَةِ مِنْ خَطَإِ السُّنَّةِ .
English
Yahya related to me from Malik that Ibn Shihab said, "Walking behind the bier is in contradiction to the sunna