"...And offer your Salāt (prayer) neither aloud nor in a low voice..." (V.17:110)
Narrated Aisha:The (above) verse was revealed in connection with the invocations.
Reference
Sahih al-Bukhari 4723
In-book reference
Book 65, Hadith 245
USC-MSA web (English)
Vol. 6, Book 60, Hadith 247
Translation by Dr. M. Muhsin Khan · Language: EN
Sahih
Arabic Text
حَدَّثَنِي طَلْقُ بْنُ غَنَّامٍ، حَدَّثَنَا زَائِدَةُ، عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ أُنْزِلَ ذَلِكَ فِي الدُّعَاءِ.