Uthman ibn Affan reported: The Messenger of Allah, peace and blessings be upon him, said, “Whoever prays the evening prayer in congregation is as if he has stood for prayer half of the night. Whoever prays the dawn prayer in congregation is as if he has stood for prayer the entire night.”
Source: Ṣaḥīḥ Muslim 656
Grade: Sahih (authentic) according to Muslim
عن عثمان بن عفان قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَنْ صَلَّى الْعِشَاءَ فِي جَمَاعَةٍ فَكَأَنَّمَا قَامَ نِصْفَ اللَّيْلِ وَمَنْ صَلَّى الصُّبْحَ فِي جَمَاعَةٍ فَكَأَنَّمَا صَلَّى اللَّيْلَ كُلَّهُ
656 صحيح مسلم كتاب المساجد ومواضع الصلاة باب فضل صلاة العشاء والصبح في جماعة