It was narrated that Ibn Mas'ud said:

"We used to pray with the Messenger of Allah ﷺ and we would say: "Peace (As-Salam) be upon Allah (Subhanahu-wa-Taala), peace be upon Jibril, peace be upon Mika'il.' The Messenger of Allah ﷺ said: 'Do not say "Peace (As-Salam) be upon Allah, for Allah is As-Salam." Rather say: "At-tahiyyatu lillahi was-salawatu wat-tayyibat, as-salamu 'alaika ayyuhan-Nabiyyu wa rahmatAllahi wa baraktuhu. As-salamu 'alaina wa 'ala 'ibad illahis-salihin, ashahdu an la illaha ill-Allah wa ashhadu anna Muhammadan 'abduhu wa rasuluhu (Allah compliments, prayers and pure words are due to Allah. Peace be upon you, O Prophet, and the mercy of Allah (Subhanahu-wa-Taala) and his blessings. Peace be upon us and upon the righteous slaves of Allah (Subhanahu-wa-Taala). I bear witness that none has the right to be worshipped except Allah and I bear witness that Muhammad is His slave and Messenger)."

أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا هِشَامٌ، - هُوَ الدَّسْتَوَائِيُّ - عَنْ حَمَّادٍ، عَنْ أَبِي وَائِلٍ، عَنِ ابْنِ مَسْعُودٍ، قَالَ كُنَّا نُصَلِّي مَعَ رَسُولِ اللَّهِ ﷺ فَنَقُولُ السَّلاَمُ عَلَى اللَّهِ السَّلاَمُ عَلَى جِبْرِيلَ السَّلاَمُ عَلَى مِيكَائِيلَ . فَقَالَ رَسُولُ اللَّهِ ﷺ " لاَ تَقُولُوا السَّلاَمُ عَلَى اللَّهِ فَإِنَّ اللَّهَ هُوَ السَّلاَمُ وَلَكِنْ قُولُوا التَّحِيَّاتُ لِلَّهِ وَالصَّلَوَاتُ وَالطَّيِّبَاتُ السَّلاَمُ عَلَيْكَ أَيُّهَا النَّبِيُّ وَرَحْمَةُ اللَّهِ وَبَرَكَاتُهُ السَّلاَمُ عَلَيْنَا وَعَلَى عِبَادِ اللَّهِ الصَّالِحِينَ أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ " .