Purification of the Soul
قَالَ رَسُولُ اللٌّهِ )ص):مَثَلُ الصَّلَوَاتِ الْخَمْسِ كَمَثَلِ نَهْرٍ جَارٍ عَذْبٍ عَلى بَابِ أَحَدِكُمْ يَغْتَسِلُ فِيهِ كُلُّ يَومٍ خَمْسَ مَرَّاتٍ فَمَا يَبقَى ذٌلِكَ مِنَ الدَّنَسِ
The Messenger of Allah (peace be upon him and his progeny) said: “The example of the five (daily) prayers is like that of a clear-water river flowing in front of your houses in which a person washes himself five times a day – cleansing him from all dirt.”
Kanzul `Ummal, Volume 7, Tradition 18931
Other links:
The Benefits of Prayers
Prayers and Children
The Face of Religion