'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.'"