Musannaf Ibn Abi Shayba 27:311

Khalaf ibn Khalifah narrated to us, from Isma'il ibn Abi Khalid, that 'Aishah looked at the Messenger of Allah (may Allah bless him and grant him peace) and said, "O master of the Arabs." He said, "I am the master of the children of Adam, and there is no boast. And your father is the master of the elderly of the Arabs."