Musnad Ahmad 830:3

Yahya narrated to us, from 'Uyaynah, and Waki' narrated to us, 'Uyaynah ibn 'Abd al-Rahman narrated to us, from his father, from Abu Bakrah, who said: "We saw ourselves with the Messenger of Allah, peace and blessings of Allah be upon him, and we were almost jogging with it [the funeral procession]." Waki' said: "Meaning, we were jogging with the funeral."