Uthman bin Affan entered the mosque after the sunset prayer and sat down alone, so I went and sat with him. He said, "Nephew, I heard the Messenger of Allah ﷺ say, 'Whoever prays the night prayer in congregation, it is as if he stood in prayer for half the night, and whoever prays the dawn prayer in congregation, it is as if he prayed the entire night.'"
دخل عثمان بن عفان المسجد بعد صلاة المغرب، فقعد وحده، فقعدت إليه، فقال: يا ابن أخي سمعت رسول الله ﷺ يقول: من صلى العشاء في جماعة فكأنما قام نصف الليل، ومن صلى الصبح في جماعة فكأنما صلى الليل كله.
Muslim narrated it in the Book of Mosques (656) from Ishaq bin Ibrahim, who said, Mughira bin Salama Makhzumi informed us, Abdul-Wahid, who is Ibn Ziyad, told us, Uthman bin Hakeem told us, Abdul-Rahman bin Abu Amra told us, and he related it.