Musnad Ahmad 788:237

Ali ibn Abdullah narrated to us, he said: Jarir narrated to us, from Sulayman al-Taymi, from Qatadah, from Abu Ghallab, from Hattan ibn Abdullah al-Raqashi, from Abu Musa, who said: The Messenger of Allah, may Allah bless him and grant him peace, taught us and said: "When you stand for prayer, let one of you lead you, and when the Imam recites, then listen silently."