مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4083
Musnad of Abdullah bin Mas'ood
It was narrated that Ibn Mas'ood said: We asked the Messenger of Allah (ﷺ) about walking with the bier and he said: "A rapid walk. The bier should be followed rather than follow.”
Musnad Ahmad 4110Its isnad is da'eef because Abu Majid al-Hanafi is unknown]