(187) باب إِخْفَاءِ التَّشَهُّدِ
Narrated Abdullah ibn Mas'ud:
It pertains to the sunnah to utter the tashahhud quietly. (RU)
Reference (RU): Sunan Abi Dawud 986 (RU)
In-book reference (RU): Book 2, Hadith 597 (RU)
English translation (RU): Book 3, Hadith 981 (RU)