Sahih Muslim

Sahih Muslim, Hadith 2704d

Book 48: The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness
Chapter 13: Chapter: It Is Recommend To Lower One's Voice When Saying Remembrance, Except In The Cases Where It Is Commanded To Raise The Voice Such As The Talbiyah Etc. It Is Recommend To Say A Great Deal, "There Is No Power And No Strength Except With Allah"

باب اسْتِحْبَابِ خَفْضِ الصَّوْتِ بِالذِّكْرِ

وَحَدَّثَنَاهُ مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، حَدَّثَنَا الْمُعْتَمِرُ، عَنْ أَبِيهِ، حَدَّثَنَا أَبُو عُثْمَانَ، عَنْ أَبِي مُوسَى، قَالَ بَيْنَمَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَذَكَرَ نَحْوَهُ ‏.‏

This hadith has been transmitted on the authority of Abu Musa with a slight variation of wording.

Read it in place: 48. The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness