Musnad Abu Ya'la al-Mawsili 243:108

'Asim ibn al-Nadr al-Ahwal narrated to us, al-Mu'tamir ibn Sulayman narrated to us, he said: I heard my father, Abu 'Uthman narrated to us, from Anas ibn Jundul, narrating to him that Anas heard from Abu Musa saying: The Prophet, may Allah bless him and grant him peace, spoke of a tribulation in which the one who is sleeping is better than the one who is sitting, and the one who is sitting in it is better than the one who is standing, and the one who is standing in it is better than the one who is walking, or as he said.