Musnad Abu Ya'la al-Mawsili 109:293

Ibn Numayr narrated to us, my father narrated to us, from al-A‘mash, from Abu Sufyan, from Jabir, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "The likeness of the prayers is like a flowing river at the door of one of you, from which he bathes five times every day."