Mishkat al-Masabih #862
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنِ ابْنِ مَسْعُودٍ كَانَ يَقُولُ: مِنَ السُّنَّةِ إِخْفَاءُ التَّشَهُّدِ. رَوَاهُ أَبُو دَاوُدَ وَالتِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ
Ibn Mas'ud used to say, “It pertains to the sunna to repeat the tashahhud quietly.”
Abu Dawud and Tirmidhi transmitted it, and Tirmidhi said this is a hasan gharib tradition.
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About Mishkat al-Masabih
This hadith is #862 from Mishkat al-Masabih, in the Book of Prayer.