'Abdullah ibn 'Amr reported his fasting was mentioned to the Messenger of Allah, may Allah bless him and grant him peace. He said, "The Prophet, may Allah bless him and grant him peace, came to visit me and I threw him a leather cushion stuffed with palm fibre, but he sat on the ground. The cushion remained between me and him. He asked me, 'Are three days every month enough for you?' I said, 'Messenger of Allah!' He said, 'Five?' I said, 'Messenger of Allah!' He said, Eleven?' I said, 'Messenger of Allah!' Then he said, 'Do not exceed the fast of Da'ud. Half of the time. Fast one day and break the fast the next.'"
Reported by Al-Bukhari (No. 6277), Muslim (No. 1159m) and An-Nasa’i (No. 2402). Cited in Al-Adab al-Mufrad (No. 1176).
‘Abdullāh ibn ‘Amr ibn al-‘Ās (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) was told that I had said: "By Allah, I will fast every day and pray every night for as long as I live." The Messenger (may Allah's peace and blessings be upon…
"You fast continuously and stand in prayer at night?" I said: Yes. He said: "If you do that, your eyes will become weak, and your soul will become weary. No fasting counts for the one who fasts continuously. Fasting three days is like fasting the entire year". I said: Indeed, I am capable of more…