Musnad Abu Ya'la al-Mawsili 42:296

Zuhayr narrated to us, Yazid bin Harun narrated to us, Muhammad bin ‘Amr bin ‘Alqamah narrated to us, from Abu Salamah, from Abu Sa’id, who said: The Messenger of Allah (may Allah bless him and grant him peace) forbade *al-muhaqalah* and *al-muzabanah*.