Sunan Abi Dawud

Narrated Anas ibn Malik: The Messenger of Allah (ﷺ) had himself cupped on the surface of his foot because of a pain in it while he was in the sacred state (wearing ihram). Abu Dawud said: I heard Ahmad say: ""Ibn Abi 'Arubah narrated it in Mursal form"". Meaning from Qatadah