Jami` at-Tirmidhi 291
جامع الترمذي#291Sahihحَدَّثَنَا 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 . قَالَ أَبُو عِيسَى حَدِيثُ ابْنِ مَسْعُودٍ حَدِيثٌ حَسَنٌ غَرِيبٌ . وَالْعَمَلُ عَلَيْهِ عِنْدَ أَهْلِ الْعِلْمِ .
Abdullah bin Mas`ud said:"It is from the Sunnah to say the Tashahhud quietly
Scholarly Authentication
The label above is the grade most of these scholars gave, each scholar counted once — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. When they judged only its chain of narrators (“Isnaad”), the label says “Sound chain”. Each scholar's own wording:
Our source also lists this ruling under Ahmad Muhammad Shakir, the editor of the printed edition it was taken from. It is al-Albani's ruling printed again, so it is counted once.
In-book reference: 2:143