Ubaidullah ibn Mu'adh narrated to us, saying: My father narrated to us, saying: 'Asim — and he is Ibn Muhammad ibn Zaid ibn 'Abdullah ibn 'Umar — narrated to us from his father, who said: 'Abdullah said: The Messenger of Allah, peace and blessings be upon him, said: "Islam is built upon five: the testimony that there is no god but Allah and that Muhammad is His servant and His Messenger, the establishment of prayer, the giving of zakat, the pilgrimage to the House, and the fasting of Ramadan."