Narrated `Abdullah bin `Amr: Allah's Apostle was informed that I have said: By Allah, I will fast all the days and pray all the nights as long as I live. On that, Allah's Apostle asked me. Are you the one who says: 'I will fast all the days and pray all the nights as long as I live?' I said, Yes, I have said it. He said, You cannot do that. So fast (sometimes) and do not fast (sometimes). Pray and sleep. Fast for three days a month, for the reward of a good deed is multiplied by ten time, and so the fasting of three days a month equals the fasting of a year. I said, O Allah's Apostle! I can do (fast) more than this. He said, Fast on every third day. I said: I can do (fast) more than that, He said: Fast on alternate days and this was the fasting of David which is the most moderate sort of fasting. I said, O Allah's Apostle! I can do (fast) more than that. He said, There is nothing better than that.