In The Name of Allaah, The Most Merciful, The Bestower of Mercy
If the Imaam goes to Ruku before those praying behind him finish recitation of Soorah Faatihah, do they go into ruku or complete its recitation?
Answer: Indeed, this (affair) is based on the research concerning whether recitation of Soorah Faatihah is obligatory upon those praying behind the Imaam or whether the (obligation of reciting faatihah is carried out) by the Imaam (on behalf of those praying behind him). (…) Read the full answer here.
Qur'aan and the Sunnah upon the way of the Salaf. 