Musnad Ahmad 31:886

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from Zayd ibn Aslam, from Ibn Abi Sa'id, from Abu Sa'id al-Khudri, who said: "The Messenger of Allah (peace and blessings of Allah be upon him) commanded us not to let anyone pass in front of us. If he refuses, then we should push him away, or something similar to this."