Musnad Ahmad 27:373

Rawh narrated to us, Ibn Jurayj narrated to us, Nafi’ informed me that Ibn ‘Umar used to say: I heard the Prophet, peace and blessings of Allah be upon him, saying: "At your service, O Allah, at your service. At your service, there is no partner for You, at your service. Indeed, all praise and grace belong to You, and the dominion; there is no partner for You."