Messenger of Allah said: "Whoever attends Isha (prayer) in congregation, then he has (the reward as if he had) stood half of the night. And whoever prays Isha and Fajr in congregation, then he has (the reward as if he had) spend the entire night standing (in prayer)."
قَالَ رَسُولُ اللَّهِ ﷺ مَنْ شَهِدَ الْعِشَاءَ فِي جَمَاعَةٍ كَانَ لَهُ قِيَامُ نِصْفِ لَيْلَةٍ وَمَنْ صَلَّى الْعِشَاءَ وَالْفَجْرَ فِي جَمَاعَةٍ كَانَ لَهُ كَقِيَامِ لَيْلَةٍ قَالَ وَفِي الْبَابِ عَنِ ابْنِ عُمَرَ وَأَبِي هُرَيْرَةَ وَأَنَسٍ وَعُمَارَةَ بْنِ رُوَيْبَةَ وَجُنْدَبِ بْنِ عَبْدِ اللَّهِ بْنِ سُفْيَانَ الْبَجَلِيِّ وَأُبَىِّ بْنِ كَعْبٍ وَأَبِي مُوسَى وَبُرَيْدَةَ