Virtue: I bear witness that none has the right to be worshipped but Allah alone, Who has no partner; and I bear witness that Muhammad is His slave and His Messenger. [Sahih Muslim 1/209]
O Allah, make me among those who turn to You in repentance, and make me among those who are purified [At-Tirmithi 1/78]
Glory is to You, O Allah, and praise; I bear witness that there is none worthy of worship but You. I seek Your forgiveness and turn to You in repentance. [An-Nasa'i p. 173]
The purification of body strengthens your soul which ultimately bring you close to Allah. An important reason why Islam emphasises on purity, as it is the basic part of faith in Islam.
Every Muslim performs ablution (wudhu), before offering prayers. It is a simple, certain and obligatory pattern of washing ones body parts with which they start their prayers. As Allah said in Holy Quran:
" O you who have believed, when you rise to [perform] prayer, wash your faces and your forearms to the elbows and wipe over your heads and wash your feet to the ankles." (Al-Maidah)
EXPIATION OF SINS
“He who performs the Wudu perfectly (i.e., according to Sunnah), his sins will depart from his body, even from under his nails.” [Muslim]
He who performs Wudu like this, his previous sins will be forgiven and his Salat and walking to the mosque will be considered as supererogatory act of worship.” [Muslim].
“When a Muslim, or a believer, washes his face (in the course of Wudu), every sin which he committed with his eyes, will be washed away from his face with water, or with the last drop of water; when he washes his hands, every sin which is committed by his hands will be effaced from his hands with the water, or with the last drop of water; and when he washes his feet, every sin his feet committed will be washed away with the water, or with the last drop of water; until he finally emerges cleansed of all his sins.” [Muslim]
Reference: Muslim 1/209