Musnad Ahmad 1007:66

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from Ghaylan ibn Jarir that he heard ‘Abdullah ibn Ma‘bad al-Zamani narrating from Abu Qatadah, that the Messenger of Allah (peace and blessings of Allah be upon him) was asked about his fasting, and he became angry. ‘Umar said: "We are pleased with Allah as Lord, with Islam as a religion, and with Muhammad as a Messenger." Then he mentioned the rest of the hadith.