The Prophet (S) said to Abu Bakr: "I passed by you while you were reciting and your voice was low." He said: "I let He who, I was consulting hear." He said: "Raise your voice." Then he said to Umar: "I passed by while you were reciting and your voice was loud." So he said: "I repel drowsiness and keep Ash-Shaitan away." So he said: "Lower your voice."  

أَنَّ النَّبِيَّ ﷺ قَالَ لأَبِي بَكْرٍ مَرَرْتُ بِكَ وَأَنْتَ تَقْرَأُ وَأَنْتَ تَخْفِضُ مِنْ صَوْتِكَ فَقَالَ إِنِّي أَسْمَعْتُ مَنْ نَاجَيْتُ قَالَ ارْفَعْ قَلِيلاً وَقَالَ لِعُمَرَ مَرَرْتُ بِكَ وَأَنْتَ تَقْرَأُ وَأَنْتَ تَرْفَعُ صَوْتَكَ قَالَ إِنِّي أُوقِظُ الْوَسْنَانَ وَأَطْرُدُ الشَّيْطَانَ قَالَ اخْفِضْ قَلِيلاً قَالَ وَفِي الْبَابِ عَنْ عَائِشَةَ وَأُمِّ هَانِئٍ وَأَنَسٍ وَأُمِّ سَلَمَةَ وَابْنِ عَبَّاسٍ  

"The Prophet (S) stood (in prayer) with an Ayah from the Qur'an at night"  

قَامَ النَّبِيُّ ﷺ بِآيَةٍ مِنَ الْقُرْآنِ لَيْلَةً  

"I asked Aishah how the recitation of the Prophet (S) was at night. [Would he recite silently o audibly?] So she said: 'He would do both of those. Sometimes he was silent with his recitation and sometimes it was audible.' So I said: 'All praise is due to Allah, the One who made the matter broad.'"  

سَأَلْتُ عَائِشَةَ كَيْفَ كَانَ قِرَاءَةُ النَّبِيِّ ﷺ بِاللَّيْلِ أَكَانَ يُسِرُّ بِالْقِرَاءَةِ أَمْ يَجْهَرُ فَقَالَتْ كُلُّ ذَلِكَ قَدْ كَانَ يَفْعَلُ رُبَّمَا أَسَرَّ بِالْقِرَاءَةِ وَرُبَّمَا جَهَرَ فَقُلْتُ الْحَمْدُ لِلَّهِ الَّذِي جَعَلَ فِي الأَمْرِ سَعَةً