It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him), he said that they used to pray behind the Prophet (peace and blessings of Allah be upon him), when a man said: «السلام على اللہ» "Peace be upon Allah." When the Prophet (peace and blessings of Allah be upon him) finished the prayer, he said: Who said, "Peace be upon Allah"? Allah Himself is Peace. Rather, you should say: «التَّحِيَّاتُ لِلَّهِ وَالصَّلَوَاتُ وَالطَّيِّبَاتُ، السَّلَامُ عَلَيْكَ أَيُّهَا النَّبِيُّ وَرَحْمَةُ اللَّهِ وَبَرَكَاتُهُ، السَّلَامُ عَلَيْنَا وَعَلَى عِبَادِ اللَّهِ الصَّالِحِينَ، أَشْهَدُ أَنْ لَا إِلَٰهَ إِلَّا اللَّهُ، وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ» All verbal, physical, and financial acts of worship are for Allah alone. O Prophet, peace be upon you, and the mercy of Allah and His blessings. Peace be upon us and upon the righteous servants of Allah. I bear witness that there is no god but Allah. And I bear witness that Muhammad (peace and blessings of Allah be upon him) is His servant and His Messenger. Then he said: The Companions used to learn it in this way as one of you learns a surah from the Qur'an.