ISHA PRAYER IN CONGREGATION H 1088 "Whosoever offers the night prayer in congregation it is as if he had spent half the night in voluntary prayer, and he who offers the night and dawn prayers in congregation, it is as if he had spent the entire night in voluntary prayer." R 1088 Tirmidhi who related this.
وفي رواية الترمذي عن عثمان بن عفان رضي الله عنه ، قَالَ : قال رَسُول اللهِ صلى الله عليه وآله وسلم : "مَنْ شَهِدَ العِشَاءَ فِي جَمَاعَةٍ كَانَ لَهُ قِيَامُ نِصْفَ لَيلَةٍ ، وَمَنْ صَلَّى العِشَاءَ وَالفَجْرَ فِي جَمَاعَةٍ ، كَانَ لَهُ كَقِيَامِ لَيْلَةٍ" قَالَ الترمذي : "حديث حسن صحيح" .