عَنْ أَبِي مُوسَى الْأَشْعَرِيِّ رَضِيَ اللَّهُ عَنْهُ قَالَ: عَلَّمَنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ، قَالَ: ((إِذَا قُمْتُمْ إِلَى الصَّلَاةِ فَلْيُؤُمَّكُمْ أَحَدُكُمْ، وَإِذَا قَرَأَ الْإِمَامُ فَأَنْصِتُوا))
Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) says: The Messenger of Allah (peace and blessings be upon him) taught us (certain matters), and among them he also said: When you stand for prayer, one man among you should lead (as imam), and when the imam recites (Qur'an), you should remain silent.