Musnad Ahmad 31:722

Hassan narrated to us, Ibn Lahi'ah narrated to us, Darraj narrated to us, from Abu al-Haytham, from Abu Sa'id al-Khudri, from the Messenger of Allah, peace and blessings of Allah be upon him, who said: "Increase in the enduring good deeds." It was said: "And what are they, O Messenger of Allah?" He said: "The creed (al-millah)." It was said: "And what is it, O Messenger of Allah?" He said: "The creed." It was said: "And what is it, O Messenger of Allah?" He said: "The declaration of Allah's greatness (Takbir), the declaration of His oneness (Tahlil), the declaration of His perfection (Tasbih), the declaration of His praise (Tahmid), and there is no might nor power except by Allah."