Sunan An Nasai 1175

أَخْبَرَنَا قُتَيْبَةُ، ‏‏‏‏‏‏قال:‏‏‏‏ حَدَّثَنَا اللَّيْثُ بْنُ سَعْدٍ، ‏‏‏‏‏‏عَنْ أَبِي الزُّبَيْرِ، ‏‏‏‏‏‏عَنْ سَعِيدِ بْنِ جُبَيْرٍ وَطَاوُسٍ، ‏‏‏‏‏‏عَنِ ابْنِ عَبَّاسٍ، ‏‏‏‏‏‏قال:‏‏‏‏ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُعَلِّمُنَا التَّشَهُّدَ كَمَا يُعَلِّمُنَا الْقُرْآنَ وَكَانَ يَقُولُ:‏‏‏‏ التَّحِيَّاتُ الْمُبَارَكَاتُ الصَّلَوَاتُ الطَّيِّبَاتُ لِلَّهِ سَلَامٌ عَلَيْكَ أَيُّهَا النَّبِيُّ وَرَحْمَةُ اللَّهِ وَبَرَكَاتُهُ سَلَامٌ عَلَيْنَا وَعَلَى عِبَادِ اللَّهِ الصَّالِحِينَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ .

It was narrated that Ibn 'Abbas said: The Messenger of Allah (ﷺ) used to teach us the tashahhud as he taught us the Quran, and he used to say: : 'At-tahiyyatu lillahi was-salawatu wat-tayyibat, as-salamu 'alaika ayyuhan-Nabiyyu wa rahmatAllahi wa barakatuhu. As-salamu 'alaina wa 'ala 'ibad illahis-salihin, ash-hadu an la ilaha ill-Allah wa ash-hadu anna Muhammadan 'abduhu wa rasuluhu (All compliments, prayers and pure words are due to Allah. Peace be upon you, O Prophet, and the mercy of Allah (SWT) and his blessings. Peace be upon us and upon the righteous slaves of Allah (SWT). I bear witness that none has the right to be worshipped except Allah and I bear witness that Muhammad is His slave and Messenger).'