Abdullah ibn 'Amr reported his fasting was mentioned to the Messenger of Allah (ﷺ). He said, "The Prophet (ﷺ) 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.'"