Jami` at-Tirmidhi, Book 48, Hadith 97 (In-Book) ⓘ
Abu Hurairah narrated that : the Messenger of Allah said: “Whoever says: ‘Glory is to Allah, and with His Praise (Subḥān Allāh, wa biḥamdih)’ a hundred times, his sins are forgiven, even if they were like the foam of the sea.”
حَدَّثَنَا نَصْرُ بْنُ عَبْدِ الرَّحْمَنِ الْكُوفِيُّ، حَدَّثَنَا الْمُحَارِبِيُّ، عَنْ مَالِكِ بْنِ أَنَسٍ، عَنْ سُمَىٍّ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " مَنْ قَالَ سُبْحَانَ اللَّهِ وَبِحَمْدِهِ مِائَةَ مَرَّةٍ غُفِرَتْ لَهُ ذُنُوبُهُ وَإِنْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ " . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
also referenced under: Hadith 3466 (Reference) & Volume 6, Book 45, Hadith 3466 (DarusSalam)