It has been narrated from the 6th Imam...
It has been narrated from the 6th Imam, Ja'far ibn Muhammad as- Sadiq, peace be upon him, quoting his forefathers up to the Messenger of Allah, peace be upon him and his family, that he said: لو كان على باب أحدكم نهر فاغتسل منه كل يوم خمس مرات، هل كان يبقى على جسده من الدرن شئ؟ انما مثل الصلاة مثل النهر الذي ينقى الدرن، كلما صلى صلاة كان كفارة لذنوبه الا ذنب أخرجه من الايمان مقيم عليه.
"If there was a stream at the house of any one of you in which he washes himself five times a day, will there remain any dirt on your body? Verily, the likeness of the Salat is the same as the stream. The person who establishes the ritual prayers clears out his sins thereby, except for the sin that takes him out from the faith that he believes in." (Bihar al-Anwar, Vol. 82, Pg.
In the same narration, it is mentioned that the Takbir (Allahu Akbar) that the believers say after the leader of the salat is better and more beloved to Allah that sixty thousand I:I jj and 'Umrah, and better than this world and all that is in it - sixty times over! Each Rak'at that the believer performs in Jama'at is better than offering one hundred thousand dinars in charity to the poor, and his sajdah is better than if he was to free one hundred slaves.
It has been emphatically recommended that all obligatory salat, with special emphasis on salat al-Fajr, Maghrib and 'Isha be offered in congregation. More stress has been laid upon those who live in the neighborhood of a Masjid, and upon those who can normally hear the Adhan from their homes.