وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، أَنَّهُ قَالَ الْمَشْىُ خَلْفَ الْجَنَازَةِ مِنْ خَطَإِ السُّنَّةِ ‏.‏

Yahya related to me from Malik that Ibn Shihab said, "Walkingbehind the bier is in contradiction to the sunna." Translation Not Available

Book Ref: Muwatta Imam Malik Book 16 Hadith 533
Web Ref:  Muwatta Imam Malik Book 16 Hadith 11