Sahih al-Bukhari, Volume 6, Book 60, Hadith 449 (USC-MSA) ⓘ

Narrated Ibn `Abbas: The Prophet used to move his tongue when the divine Inspiration was being revealed to him. (Sufyan, a subnarrator, demonstrated (how the Prophet used to move his lips) and added. "In order to memorize it." So Allah revealed: "Move not your tongue concerning (the Qur'an) to make haste therewith." (75.16)

حَدَّثَنَا الْحُمَيْدِيُّ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا مُوسَى بْنُ أَبِي عَائِشَةَ ـ وَكَانَ ثِقَةً ـ عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا نَزَلَ عَلَيْهِ الْوَحْىُ حَرَّكَ بِهِ لِسَانَهُ ـ وَوَصَفَ سُفْيَانُ ـ يُرِيدُ أَنْ يَحْفَظَهُ فَأَنْزَلَ اللَّهُ ‏{‏لاَ تُحَرِّكْ بِهِ لِسَانَكَ لِتَعْجَلَ بِهِ‏}‏