Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tirmidhi:291 – Abū Saʿīd al-Ashaj > Yūnus b. Bukayr > Muḥammad b. Isḥāq > ʿAbd al-Raḥman b. al-Aswad from his father > ʿAbdullāh b. Masʿūd > from al-Sunnah

"It is from the Sunnah to say the Tashahhud quietly"  

الترمذي:٢٩١ – حَدَّثَنَا أَبُو سَعِيدٍ الأَشَجُّ حَدَّثَنَا يُونُسُ بْنُ بُكَيْرٍ عَنْ مُحَمَّدِ بْنِ إِسْحَاقَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ الأَسْوَدِ عَنْ أَبِيهِ عَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ قَالَ مِنَ السُّنَّةِ أَنْ يُخْفِيَ التَّشَهُّدَ
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قَالَ أَبُو عِيسَى حَدِيثُ ابْنِ مَسْعُودٍ حَدِيثٌ حَسَنٌ غَرِيبٌ وَالْعَمَلُ عَلَيْهِ عِنْدَ أَهْلِ الْعِلْمِ