It wasnarrated that Anas bin Malik said:
"The Messenger of Allah(ﷺ),Abu Bakr, 'Umar and 'Uthman used to walk ahead of the funeral(procession)." (ID)
English reference (ID): Vol. 1, Book 6, Hadith 1483 (ID)
Arabic reference (ID): Book 6, Hadith 1550 (ID)