And Zuhayr ibn Harb and Muhammad ibn Hatim narrated to me, both from Ibn Mahdi. Zuhayr said: 'Abd al-Rahman ibn Mahdi narrated to us, Salim ibn Hayyan narrated to us, Sa'id ibn Mina' narrated to us, who said: 'Abdullah ibn 'Amr said: The Messenger of Allah, peace and blessings be upon him, said to me: "O 'Abdullah ibn 'Amr, it has reached me that you fast during the day and stand in prayer at night. Do not do so, for your body has a right upon you, your eyes have a right upon you, and your spouse has a right upon you. Fast and break your fast. Fast three days of every month, for that is the fasting of all time." I said: "O Messenger of Allah, I have strength." He said: "Then fast the fast of Dawud, peace be upon him — fast one day and break your fast one day." He ('Abdullah ibn 'Amr) used to say: "Would that I had accepted the concession."