BAYHAQI 2427:
from al-Barāʾ —
[Machine] The Messenger of Allah ﷺ said, "Adorn the Quran with your voices.'' Abdullah said: "I had forgotten this word until Dahhak bin Mazahim reminded me of it," and in the narration of Abu Dawud, Shu'bah said: "I had forgotten this letter until Dahhak bin Mazahim reminded me of it."
البيهقي ٢٤٢٧:
عن البراء —
قَالَ رَسُولُ اللهِ ﷺ زَيِّنُوا الْقُرْآنَ بِأَصْوَاتِكُمْ قَالَ عَبْدُ الرَّحْمَنِ وَكُنْتُ نَسِيتُ هَذِهِ الْكَلِمَةَ حَتَّى ذَكَّرَنِيهَا الضَّحَّاكُ بْنُ مُزَاحِمٍ وَفِي رِوَايَةِ أَبِي دَاوُدَ عَنْ شُعْبَةَ فَنَسِيتُ هَذَا الْحَرْفَ حَتَّى ذَكَّرَنِيهِ الضَّحَّاكُ بْنُ مُزَاحِمٍ
hadithunlocked.com