Musnad Abu Ya'la al-Mawsili 150:90

Muhammad ibn al-Sabbah narrated to us, Ibrahim ibn Sa'd narrated to us, my father narrated to us, from al-Qasim ibn Muhammad, from 'Aishah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever introduces into this matter of ours that which is not of it, then it is rejected."