Namaz-e-Jama'at

The Holy Prophet of Islam (saw) said: " The rows of my followers in the congregational (Jama'at) prayer on the earth are like the rows of angels in the sky; and a rak'at of prayer in congregation is equivalent with twenty-four rak'ats, and every rak'at with Allah, Almighty and Glorious, is more beloved than forty years of worship. Therefore, on the Day of Judgement, when Allah gathers all human beings from the beginning to the end for Reckoning, there will be no believer who has attended the congregational prayer but for whom Allah will decrease the grievousness of the Day of Reckoning and after that the one will be told to enter Paradise.

Biharul Anwaar, vol. 88 page 6.