مُوَطَّأُ مَالِكٍ
Muwatta Malik 533
Burials
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، أَنَّهُ قَالَ الْمَشْىُ خَلْفَ الْجَنَازَةِ مِنْ خَطَإِ السُّنَّةِ .
Yahya related to me from Malik that Ibn Shihab said, "Walking behind the bier is in contradiction to the sunna."
Arabic/English book reference: Book 16, Hadith 11