Musnad Ahmad

Hattan bin Abdullah says that once Hazrat Abu Musa (may Allah be pleased with him) led his companions in prayer. During the prayer, when they sat in the "jalsa" (sitting position), someone said that prayer has been equated with virtue and zakat. After finishing the prayer, Hazrat Abu Musa (may Allah be pleased with him) turned towards the people and asked, "Who among you said this statement?" The people remained silent. He said to Hattan, "Hattan! Perhaps you said this sentence?" Hattan said, "By Allah! I did not say this sentence, and I was afraid that you might consider me foolish." Then a man spoke up and said, "I said the sentence, and I said it only with a good intention." Hazrat Abu Musa (may Allah be pleased with him) said, "Do you not know what should be recited in prayer? The Noble Prophet (peace and blessings be upon him) once gave us a sermon, and in it, he clarified for us the Sunnahs and the method of prayer, and said: 'Keep your rows straight. Then, the one who knows more Qur'an should lead the prayer. When he says the takbeer, you also say the takbeer. When he says 'wa la ad-dalleen,' you say 'Ameen.' Allah will accept your supplication. When he says the takbeer and goes into ruku', you also say the takbeer and go into ruku', because the imam will bow before you and will raise his head before you; this is thus equal. When he says 'Sami' Allahu liman hamidah,' you say 'Rabbana lakal hamd.' Allah will accept your supplication, because Allah has said through the tongue of His Prophet (peace and blessings be upon him) that whoever praises Allah, Allah hears him. When he says the takbeer and goes into prostration, you also say the takbeer and prostrate, because the imam will prostrate before you and will raise his head before you; and this is also equal. When he sits in the final sitting (qa'dah), then first of all you should say: 'At-tahiyyatu-tayyibatu-salawatu-lillah, as-salamu 'alayka ayyuhan-nabiyyu wa rahmatullahi wa barakatuh, as-salamu 'alayna wa 'ala 'ibadillahis-saliheen, ash-hadu an la ilaha illallah wa ash-hadu anna Muhammadan 'abduhu wa rasuluh.'"