Musnad Ahmad 33:798

'Affan narrated to us, Shu'bah narrated to us, he said: Muharib ibn Dithar informed me, he said: I heard Jabir saying: "He was with the Messenger of Allah, may Allah bless him and grant him peace, on a journey. When he arrived in Medina, he commanded him to go to the mosque and pray two rak'ahs."