Hadith 1514

It is narrated from Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace be upon him) said: "Do not precede the imam. When he says the takbir, say the takbir. When he says, 'Nor of those who have gone astray,' say, 'Ameen.' When he bows, bow. When he says, 'Sami’a Allahu liman hamidah,' say, 'Allahumma Rabbana lakal-hamd.'" This is agreed upon (by Al-Bukhari and Muslim], except that Al-Bukhari did not mention, "When he says, 'Nor of those who have gone astray.'" Ali Al-Qari said: "Our school holds that following the imam continuously is obligatory, and the letter 'fa' (so) in the hadith indicates this."