Musnad Abu Ya'la al-Mawsili 129:29

Ghassan ibn al-Rabi' and Bassam ibn Yazid narrated to us, they said: Hammad narrated to us, from Humayd, from Anas ibn Malik, that the Messenger of Allah (may Allah bless him and grant him peace) said: "The best of what you treat yourselves with is cupping (hijama). And do not torture your children by pressing (ghamz) for tonsillitis (udhra)."