Musannaf Ibn Abi Shayba 17:1166

'Abbad ibn al-'Awwam narrated to us, from Hajjaj, from a man, from Abu al-Malih, from Shaddad ibn Aws, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Circumcision is a Sunnah for men and an honor for women."