The Face of Religion
قَالَ رَسُولُ اللٌّهِ (ص): لِكُلِّ شَيْءٍ وَجْهٌ وَ وَجْهُ دِينِكُمُ الصَّلاَةُ فَلاَ يَشِينَنَّ أَحَدُكُمْ وَجْهَ دِيْـنِهِ
The Messenger of Allah (PBUH) said: “For everything there is a face and the face of your religion is prayers. So see to it that none from amongst you damages and disfigures the face of his religion.”
Biharul Anwar, Volume 82, Page 209
Other links:
The Special Rank of Prayers
The Parable of Prayers