Musnad Ahmad 30:1639

'Abd al-Samad narrated to us, 'Abd al-Hakim narrated to us, leading to Sa'id ibn Abi 'Arubah, 'Abd al-Rahman al-Asamm narrated to us, he said: I heard Abu Hurairah saying: When the Messenger of Allah, peace and blessings of Allah be upon him, would follow a funeral procession, he would say: "Walk briskly with it, and do not walk with the slow gait of the Jews with their funerals."