Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
muslim:447aYaḥyá b. Yaḥyá > Yaḥyá b. Zakariyyāʾ > Hishām b. ʿUrwah from his father

" And utter not thy prayer loudly, not be low in it" (xvii. 110) relate to supplication (du'a').  

مسلم:٤٤٧aحَدَّثَنَا يَحْيَى بْنُ يَحْيَى أَخْبَرَنَا يَحْيَى بْنُ زَكَرِيَّاءَ عَنْ هِشَامِ بْنِ عُرْوَةَ عَنْ أَبِيهِ

عَنْ عَائِشَةَ فِي قَوْلِهِ ﷻ { وَلاَ تَجْهَرْ بِصَلاَتِكَ وَلاَ تُخَافِتْ بِهَا} قَالَتْ أُنْزِلَ هَذَا فِي الدُّعَاءِ  


See similar narrations below:

Collected by Bukhārī, Nasāʾī's Kubrá, Bayhaqī
bukhari:6327ʿAlī > Mālik b. Suʿayr > Hishām b. ʿUrwah from his father

The Verse: 'Neither say your prayer aloud, nor say it in a low tone.' (17.110) was revealed as regards invocation.  

البخاري:٦٣٢٧حَدَّثَنَا عَلِيٌّ حَدَّثَنَا مَالِكُ بْنُ سُعَيْرٍ حَدَّثَنَا هِشَامُ بْنُ عُرْوَةَ عَنْ أَبِيهِ

عَنْ عَائِشَةَ {وَلاَ تَجْهَرْ بِصَلاَتِكَ وَلاَ تُخَافِتْ بِهَا} أُنْزِلَتْ فِي الدُّعَاءِ  

bukhari:7526ʿUbayd b. Ismāʿīl > Abū Usāmah > Hishām from his father > ʿĀʾishah

The Verse:-- '(O Muhammad!) Neither say your prayer aloud nor say it in a low tone.' (17.110) was revealed in connection with the invocations.  

البخاري:٧٥٢٦حَدَّثَنَا عُبَيْدُ بْنُ إِسْمَاعِيلَ حَدَّثَنَا أَبُو أُسَامَةَ عَنْ هِشَامٍ عَنْ أَبِيهِ عَنْ عَائِشَةَ ؓ قَالَتْ

نَزَلَتْ هَذِهِ الآيَةُ {وَلاَ تَجْهَرْ بِصَلاَتِكَ وَلاَ تُخَافِتْ بِهَا} فِي الدُّعَاءِ  

قَوْلُهُ تَعَالَى: {وَلَا تَجْهَرْ بِصَلَاتِكَ} [الإسراء: 110]

nasai-kubra:11238Hārūn b. Isḥāq > ʿAbdah > Hishām from his father > Shuʿayb b. Yūsuf > Yaḥyá > Hishām b. ʿUrwah from my father

The Verse: 'Neither say your prayer aloud, nor say it in a low tone.' (17.110) was revealed as regards invocation. (Using translation from Bukhārī 6327)   

الكبرى للنسائي:١١٢٣٨أَخْبَرَنَا هَارُونُ بْنُ إِسْحَاقَ حَدَّثَنَا عَبْدَةُ عَنْ هِشَامٍ عَنْ أَبِيهِ وَأَخْبَرَنَا شُعَيْبُ بْنُ يُوسُفَ قَالَ حَدَّثَنَا يَحْيَى عَنْ هِشَامِ بْنِ عُرْوَةَ قَالَ أَخْبَرَنِي أَبِي

عَنْ عَائِشَةَ فِي قَوْلِهِ جَلَّ وَعَزَّ {وَلَا تَجْهَرْ بِصَلَاتِكَ وَلَا تُخَافِتْ بِهَا} [الإسراء 110] نَزَلَتْ فِي الدُّعَاءِ  

bayhaqi:3008Abū ʿAbdullāh al-Ḥāfiẓ > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Aḥmad b. ʿAbd al-Jabbār > Ibn Fuḍayl > Hishām b. ʿUrwah from his father > ʿĀʾishah

[Machine] In His saying, "Do not raise your voice in prayer nor be silent in it," [Surah Al-Isra 110], it means supplication.  

البيهقي:٣٠٠٨أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا أَحْمَدُ بْنُ عَبْدِ الْجَبَّارِ ثنا ابْنُ فُضَيْلٍ عَنْ هِشَامِ بْنِ عُرْوَةَ عَنْ أَبِيهِ عَنْ عَائِشَةَ

ؓ فِي قَوْلِهِ {لَا تَجْهَرْ بِصَلَاتِكَ وَلَا تُخَافِتْ بِهَا} [الإسراء 110] قَالَتْ هُوَ الدُّعَاءُ