Prophet Dawud (David) - David's Fasting and Praying

David fasted every other day. 'Abdullah Ibn Amr Ibn Al-As narrated: "Allah's Apostle said to me: 'The most beloved fasting to Allah was the fasting of (the Prophet) David, who used to fast alternate days. And the most beloved prayer to Allah was the prayer of David, who used to sleep for (the first) half of the night and pray for one third of it and (again) sleep for a sixth of it."

Abdullah Ibn Amr Ibn Al-As also narrated: 'The Prophet said to me: 'I have been informed that you pray all the nights and observe fast all the days; is this true?' I replied: 'Yes.' He said: 'If you do so, your eyes will be weak and you will get bored. So fast three days a month, for this will be the fasting of a whole year. (Or equal to the fasting of a whole year).' I said: 'I find myself able to fast more.' He said: 'Then fast like the fasting of (the Prophet) David who used to fast on alternate days and would not flee on facing the enemy."

Iron Becomes Flexible for David
Allah granted David great influence. His people had a great number of wars in their time, but they had a problem in that the iron armor was too heavy for the fighter to move and fight as he wished. It is said that David was sitting one day, contemplating this problem while toying with a piece of iron. Suddenly, he found his hand sinking in the iron. Almighty Allah had made it flexible for him: And We made the iron soft for him. Surah 34: 10

Saul Becomes Jealous of David
The people praised and loved David. However, the hearts of men are fickle and their memories short. Even great men can feel insecure and become petty-minded. One day David found Saul in a worried state. He sensed something strange in Saul's attitude towards him. That night, when he shared his feeling with his wife, she started to weep bitterly and said: "0 David, I will never keep any secrets from you." She told him that her father had become jealous of his popularity and feared that he would lose his kingdom to him. She advised him to be on his guard.
This information shocked David very much. He prayed and hoped that Saul's good nature would overcome the darker side of his character. The following day, Saul summoned David to inform him that Canaan had gathered its forces and would march on the kingdom. He ordered David to advance on them with the army and not to return unless victory was gained.
David sensed that this was an excuse to get rid of him: either the enemy would kill him, or in the thick of battle, Saul's henchmen might stab him in the back. Yet he hastened with his troops to meet the army of Canaan. They fought the Canaanites bravely, without thinking of their own safety. Allah granted them victory, and David lived to return to Saul.