The Prophet ﷺ was hiding himself in Mecca and used to recite the (Qur'an) in a loud voice. When the pagans heard him they would abuse the Qur'an and the one who brought it, so Allah said to His Prophet: 'Neither say your prayer aloud, nor say it in a low tone.' (17.110)
كَانَ النَّبِيُّ ﷺ مُتَوَارِيًا بِمَكَّةَ وَكَانَ يَرْفَعُ صَوْتَهُ فَإِذَا سَمِعَ الْمُشْرِكُونَ سَبُّوا الْقُرْآنَ وَمَنْ جَاءَ بِهِ فَقَالَ اللَّهُ ﷻ لِنَبِيِّهِ ﷺ {وَلاَ تَجْهَرْ بِصَلاَتِكَ وَلاَ تُخَافِتْ بِهَا}
"The Prophet ﷺ used to raise his voice when reciting Quran, and when the idolaters heard his voice they would insult the Quran and the one who had brought it. So the Prophet ﷺ began to lower his voice such that his companions would not hear him. Then Allah (SWT), the Mighty and Sublime, revealed: 'And offer your salah (prayer) neither aloud nor in a low voice, but follow a way between.'"
كَانَ النَّبِيُّ ﷺ يَرْفَعُ صَوْتَهُ بِالْقُرْآنِ وَكَانَ الْمُشْرِكُونَ إِذَا سَمِعُوا صَوْتَهُ سَبُّوا الْقُرْآنَ وَمَنْ جَاءَ بِهِ فَكَانَ النَّبِيُّ ﷺ يَخْفِضُ صَوْتَهُ بِالْقُرْآنِ مَا كَانَ يَسْمَعُهُ أَصْحَابُهُ فَأَنْزَلَ اللَّهُ ﷻ { وَلاَ تَجْهَرْ بِصَلاَتِكَ وَلاَ تُخَافِتْ بِهَا وَابْتَغِ بَيْنَ ذَلِكَ سَبِيلاً }