Sahih
Muslim
صحيح مسلم
48
The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness
كتاب الذكر والدعاء والتوبة والاستغفار
Chapter 13: 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
Sahih Muslim 2704 d
This hadith has been transmitted on the authority of Abu Musa with a slight variation of wording.
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 .
Grade: Sahih