Messenger of Allah ﷺ said, "Whoever says, 'Subhan Allah wa bihamdihi,' one hundred times a day, will be forgiven all his sins even if they were as much as the foam of the sea.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ قَالَ سُبْحَانَ اللَّهِ وَبِحَمْدِهِ فِي يَوْمٍ مِائَةَ مَرَّةٍ حُطَّتْ خَطَايَاهُ وَإِنْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ  

The Prophet ﷺ said, "There are two expressions which are very easy for the tongue to say, but they are very heavy in the balance and are very dear to The Beneficent (Allah), and they are, 'Subhan Allah Al- ʿAzim and 'Subhan Allah wa bihamdihi.'"  

عَنِ النَّبِيِّ ﷺ قَالَ كَلِمَتَانِ خَفِيفَتَانِ عَلَى اللِّسَانِ ثَقِيلَتَانِ فِي الْمِيزَانِ حَبِيبَتَانِ إِلَى الرَّحْمَنِ سُبْحَانَ اللَّهِ الْعَظِيمِ سُبْحَانَ اللَّهِ وَبِحَمْدِهِ