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.
Sahih al-Bukhari Book 97, Hadith 151
← Previous Hadith regarding the explanation of the Verse:-- '(O Muhammad!) Neither say your prayer aloud, nor say it in a low tone.' (17.110) This Verse was revealed while Allah's Messenger (ﷺ) was hiding himself at Mecca. At that time, when he led his companions in prayer, he used to raise his voice while reciting the Qur'an; and if the pagans heard him, they would abuse the Qur'an, its Revealer, and the one who brought it. So Allah said to His Prophet: "Neither say your prayer aloud. i.e., your recitation (of Qur'an) lest the pagans should hear (it) and abuse the Qur'an" nor say it in a low tone, "lest your voice should fail to reach your companions, "but follow a way between." (17.110)

Sahih al-Bukhari Book 97, Hadith 150 Next Hadith → Abu Huraira said, "Allah's Messenger (ﷺ) said, 'Whoever does not recite Qur'an in a nice voice is not from us,' and others said extra," (that means) to recite it aloud."

Sahih al-Bukhari Book 97, Hadith 152