What did the Prophet Muhammad (saw) say about fasting and standing for prayer?
 Narrated `Abdullah bin `Amr bin Al-`As:                     Allah's Apostle said, "O `Abdullah! Have I not been formed that you fast all the day and stand in prayer all night?" I said, "Yes, O Allah's Apostle!" He said, "Do not do that! Observe the fast sometimes and also leave them (the fast) at other times; stand up for the prayer at night and also sleep at night. Your body has a right over you, your eyes have a right over you and your wife has a right over you."