Narrated Abu Huraira (Radi-Allahu 'anhu):

Allah's Apostle (Sallallahu 'Alaihi Wa Sallam) said, "The congregational
prayer of anyone amongst you is more than twenty (five or twenty seven)
times in reward than his prayer in the market or in his house, for if he
performs ablution completely and then goes to the masjid with the sole
intention of performing the prayer, and nothing urges him to proceed to the
masjid except the prayer, then, on every step which he takes towards the
masjid, he will be raised one degree or one of his sins will be forgiven.
The angels will keep on asking Allah's forgiveness and blessings for
everyone of you so long as he keeps sitting at his praying place. The
angels will say, 'O Allah, bless him! O Allah, be merciful to him!' as long
as he does not do Hadath or a thing which gives trouble to the other." The
Prophet (Sallallahu 'Alaihi Wa Sallam) further said, "One is regarded in
prayer so long as one is waiting for the prayer."

Bukhari Vol. 3 : No. 330