Musnad Abu Ya'la al-Mawsili 109:103

Muhammad ibn al-Khattab narrated to us, Mu'ammal ibn Isma'il narrated to us, Sufyan narrated to us, from al-A'mash, from Abu Sufyan, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Between the servant and disbelief is the abandonment of prayer."