"It is from the Sunnah to say the Tashahhud quietly"
Jami` at-Tirmidhi Book 2, Hadith 143
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"Allah's Messenger would teach us the Tashah-hud just as he would teach us the Qur'an. He would say: (At-Tahiyyatu, al mubarakatu, as-salawatu at-tayyibatulillah. Salamun alaika ayyuhan-naibiyyu wa rahmatullahi wa barakatuhu, salamun alaina wa ala ibadalillahis-salihin. Ashhadu an la ilaha illallah, wa ashhadu anna Muhammadan abduhu wa Raduluh.) 'All greetings, goodness, prayers, and pure words are for Allah. Peace be upon you O Prophet, and Allah's mercy and His blessings, Peace be upon us and all of the righteous worshippers of Allah. I testify that there is none worthy of worship except Allah, and I testify that Muhammad is Allah's worshipper and Messenger.'"
Jami` at-Tirmidhi Book 2, Hadith 142 Next Hadith → "I arrived in Al-Madinah and I said, 'Let me look at the Salat of Allah's Messenger.' When he sat - meaning for At-Tashah-hud - he spread his left foot, and placed his left hand - meaning on his left thigh - and held his right foot erect."
Jami` at-Tirmidhi Book 2, Hadith 144
Jami` at-Tirmidhi Book 2, Hadith 142 Next Hadith → "I arrived in Al-Madinah and I said, 'Let me look at the Salat of Allah's Messenger.' When he sat - meaning for At-Tashah-hud - he spread his left foot, and placed his left hand - meaning on his left thigh - and held his right foot erect."
Jami` at-Tirmidhi Book 2, Hadith 144