Yahya related to me from Malik from Ibn Shihab that the Messengerof Allah, may Allah bless him and grant him peace, and Abu Bakr andUmar as well as the khalifas up until this time and Abdullah ibn Umar,would walk in front of the bier.
USC-MSA web (English) reference: Book 16, Hadith 8
Arabic reference: Book 16, Hadith 530