Musnad Ahmad 1153:757

Surayj narrated to us, Nafi’ narrated to us, from Ibn Abi Mulaykah: Aisha said: The Messenger of Allah (peace and blessings of Allah be upon him) became ill, so I placed my hand on his chest and said: "Remove the affliction, O Lord of the people; You are the Physician, and You are the Healer." And the Messenger of Allah (peace and blessings of Allah be upon him) was saying: "Join me with the Highest Companion, and join me with the Highest Companion."