(56) باب فَضْلِ التَّسْبِيحِ
It was narrated from Abu Hurairah that :
the Messenger of Allah (ﷺ) said: "Whoever says: Subhan Allahi wa bi hamdihi (Glory and praise is to Allah) one hundred times, his sins will be forgiven even if they were like the foam of the sea.'"
Reference: Sunan Ibn Majah 3812
In-book reference: Book 33, Hadith 157
English translation: Vol. 5, Book 33, Hadith 3812