Hadith 1582
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him), while teaching us (about prayer), used to say: "When the imam says the takbir, you should also say the takbir, and when he recites « غَيْرِ الْمَغْضُوبِ عَلَيْهِمْ وَلَا الضَّالِّينَ », you should say Ameen."