Then answered John: 'Master let us wash ourselves as God commanded by Moses.'
             Jesus said: 'Think yea that I am come to destroy the law and the prophets? Verily I say unto you, as God liveth, I am not come to destroy it, but rather to observe it. For every prophet hath observed the law of God and all that God by the other prophets hath spoken. As God liveth, in whose presence my soul standeth, no one that breaketh one least precept can be pleasing to God, but shall be least in the kingdom of God, for he shall have no part there. Moreover I say unto you, the one syllable of the law of God cannot be broken without the gravest sin. But I do you to wit that it is necessary to observe that which God saith by Isaiah the prophet, with these words "Wash you and be clean, take away your thoughts from mine eyes."

            'Verily I say unto you, that all the water of the sea will not wash him who with his heart loveth iniquities. And furthermore I say unto you, that no one will make prayer pleasing to God if he be not washed, but will burden his soul with sin like to idolatry.     
              'Believe me, in sooth, that if man should make prayer to God as is fitting, he would obtain all that he should ask. Remember Moses the servant of God, 'who with his prayer scourged Egypt, opened the Red Sea, and there drowned Pharaoh and his host.
             Remember Joshua, who made the sun stand still, Samuel, who smote with fear the innumerable host of the Philistines, Elijah, who made the fire to rain from heaven, Elisha raised a dead man, and so many other holy prophets, who by prayer obtained all that they asked. But those men truly did not seek their own in their matters, but sought only God and his honour.'

  An Islamic Perspective and Commentary
Ishaq Zahid

A person must perform ablution or be in the state of ablution before any prayer in Islam. The ablution involves washing of hands, mouth, nostrils, face, arms and feet. Additionally, one sweeps the hair, neck and ears with wet hands. A person must also be wearing clean clothes. It is also important that one has cleaned himself or herself with water after a "bathroom visit." Thus the body and clothes must be completely clean before the prayer. Many muslims keep themselves in the state of ablution by using water in every visit to the bathroom and then doing an ablution.