Concerning the saying of Allah, the Mighty and Sublime: "And offer your salah (prayer) neither aloud nor in a low voice"- It was revealed when the Messenger of Allah ﷺ was still (preaching) in secret in Makkah. When he led his companions in prayer, he would raise his voice" -(One of the narrators) Ibn Mani' said: He would recite the Quran out loud"- "And when the idolators heard his voice they would insult the Quran, and the One Who revealed it, and the one who brought it. So Allah, the Mighty and Sublime, said to His Prophet ﷺ: And offer your salah (prayer) neither aloud that is, such that the idolators can hear your recitation and insult the Quran; nor in a low voice, so that your companions cannot hear; but follow a way between." (Using translation from Nasāʾī 1011)  

فِي قَوْلِهِ {§وَلَا تَجْهَرْ بِصَلَاتِكَ وَلَا تُخَافِتْ بِهَا} [الإسراء 110] قَالَ «نَزَلَتْ وَرَسُولُ اللهِ ﷺ مُخْتَفٍ بِمَكَّةَ فَكَانَ إِذَا صَلَّى بِأَصْحَابِهِ رَفَعَ صَوْتَهُ» وَقَالَ ابْنُ مَنِيعٍ «جَهَرَ بِالْقُرْآنِ فَكَانَ الْمُشْرِكُونَ إِذَا سَمِعُوا سَبُّوا الْقُرْآنَ وَمَنْ أَنْزَلَهُ وَمَنْ جَاءَ بِهِ» فَقَالَ اللهُ لِنَبِيِّهِ ﷺ {وَلَا تَجْهَرْ بِصَلَاتِكَ} [الإسراء 110] أَيْ بِقِرَاءَتِكَ فَيَسْمَعَ الْمُشْرِكُونَ فَيَسُبُّوا الْقُرْآنَ {وَلَا تُخَافِتْ بِهَا} [الإسراء 110] أَصْحَابَكَ فَلَا يَسْمَعُونَ {وَابْتَغِ بَيْنَ ذَلِكَ سَبِيلًا} [الإسراء 110]  

"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.'" (Using translation from Nasāʾī 1012)  

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 أَصْحَابَهُ فَأَنْزَلَ اللهُ {وَلَا تَجْهَرْ بِصَلَاتِكَ وَلَا تُخَافِتْ} [الإسراء 110] بِهَا وَابْتَغِ بَيْنَ ذَلِكَ سَبِيلًا