Musnad Abu Ya'la al-Mawsili 153:28

Abu Khaythama narrated to us, Waki' narrated to us, Sufyan narrated to us, from Musa bin 'Uqbah, from Salim, from Ibn 'Umar, who said: The oath of the Messenger of Allah, peace and blessings of Allah be upon him, was: "No, and by the Turner of hearts."