Jami` at-Tirmidhi, Hadith 3329 ⓘ
Ibn Abbas said: “When the Quran was being revealed to the Messenger of Allah, he would move his tongue in attempt to memorize it. So Allah, Blessed is He and Most High, revealed: Move not your tongue concerning it to make haste therewith.” He said: “So he would move his two lips.” And Sufyan (a sub-narrator) would move his two lips.
حَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ مُوسَى بْنِ أَبِي عَائِشَةَ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا أُنْزِلَ عَلَيْهِ الْقُرْآنُ يُحَرِّكُ بِهِ لِسَانَهُ يُرِيدُ أَنْ يَحْفَظَهُ فَأَنْزَلَ اللَّهُ : ( لا تُحَرِّكْ بِهِ لِسَانَكَ لِتَعْجَلَ بِهِ ) قَالَ فَكَانَ يُحَرِّكُ بِهِ شَفَتَيْهِ وَحَرَّكَ سُفْيَانُ شَفَتَيْهِ . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ . قَالَ عَلِيٌّ قَالَ يَحْيَى بْنُ سَعِيدٍ أَثْنَى سُفْيَانُ الثَّوْرِيُّ عَلَى مُوسَى بْنِ أَبِي عَائِشَةَ خَيْرًا .
also referenced under: Book 47, Hadith 3648 (In-Book) & Volume 6, Book 44, Hadith 3329 (DarusSalam)