Hittan bin Abdullah al-Raqashi (may Allah have mercy on him) said: Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) led us in prayer and said that whenever the Messenger of Allah (peace and blessings be upon him) led us in prayer, he would tell us: "The imam is appointed only to be followed, so when he says the takbir, say the takbir, and when he recites, be silent."
Ali bin Umar (may Allah have mercy on him) said: Salim bin Nuh is not strong.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2890