Musnad Abu Ya'la al-Mawsili 148:55

On the authority of Anas, from the Prophet, may Allah bless him and grant him peace, who said: "I am the master of the children of Adam, and there is no boast. And I am the first for whom the earth will split open, and there is no boast. And I am the first to take hold of the ring of the gate of Paradise, and there is no boast. And the Banner of Praise will be in my hand, and there is no boast."