Musnad Ahmad 31:516

Yahya and Waki’ narrated to us, from Zakariya, who said: ‘Amir narrated to me, saying: Abu Sa’id and Marwan were sitting, and a funeral procession passed by them. Abu Sa’id stood up, and Marwan said: "Sit down." Abu Sa’id said: "I saw the Messenger of Allah (peace and blessings of Allah be upon him) stand up." So Marwan stood up. And Waki’ said: "A funeral procession passed by him, and he stood up."