Musnad Abu Ya'la al-Mawsili 129:116

Abu Yusuf al-Jizi narrated to us, Mu'ammal ibn Isma'il narrated to us, Hammad ibn Salamah narrated to us, from Humayd al-Tawil, from Anas ibn Malik, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Adhere constantly to 'O Possessor of Majesty and Honor' (Ya Dhal-Jalali wal-Ikram)."