Sunan Abi Dawud
Hadith #604
Narrated AbuHurayrah: The Prophet (ﷺ) said: The imam is appointed only to be followed. This version adds: When he recites (the Qur'an), keep silent."" Abu Dawud said: The addition of the words ""When he recites, keep silent"" in this version are not guarded. The misunderstanding, according to us, is on the part of Abu Khalid (a narrator)