Musnad Ahmad 31:61

Ishaq ibn Isa narrated to us, he said: Layth narrated to me, he said: Imran ibn Abi Anas narrated to me, from Ibn Abi Sa’id al-Khudri, from his father, that he said: Two men disputed in the mosque which was founded on righteousness from the first day. One man said: "It is the Mosque of Quba." And another man said: "It is the Mosque of the Messenger of Allah, may Allah bless him and grant him peace." So the Messenger of Allah, may Allah bless him and grant him peace, said: "It is my mosque."