Musnad Abu Ya'la al-Mawsili 108:30

Abu al-Rabi' narrated to us, Ya'qub narrated to us, 'Isa ibn Jariyah narrated to us, from Jabir: The Messenger of Allah (may Allah bless him and grant him peace) passed by a man in Makkah who was praying upon a rock. He went to the side and waited for a long while, then he departed. He found the man still praying in his state. He stood up, joined his hands, and then said: "O people, you must be moderate, you must be moderate. For indeed, Allah does not grow weary until you grow weary."