Hadith 1194

Abu Musa al-Ash‘ari (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: "When you pray, straighten your rows, then let one of you lead the prayer. When he says the Takbir, say the Takbir. When he says: غَيْرِ الْمَغْضُوْبِ عَلَيْهِمْ وَلَا الضَّالِّينَ, say Ameen, and Allah will respond to you. When he says the Takbir and bows, then say the Takbir and bow, for indeed the Imam bows before you and rises before you." The Messenger of Allah (peace and blessings be upon him) then said: "So, this compensates for that." He further said: "When he says: سَمِعَ اللهُ لِمَنْ حَمِدَهُ, say: اللَّهُمَّ رَبَّنَا لَكَ الْحَمْدُ, and Allah will listen to you."