Musnad Abu Ya'la al-Mawsili 108:174

Zuhayr narrated to us, Muhammad ibn Khazim narrated to us, al-A'mash narrated to us, from Abu Sufyan, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The likeness of the five prayers is like a flowing river, deep, at the door of one of you; he bathes in it every day five times."