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. (Using translation from Bukhārī 6405)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ مَنْ قَالَ سُبْحَانَ اللهِ وَبِحَمْدِهِ فِي يَوْمٍ مِائَةَ مَرَّةٍ حُطَّتْ خَطَايَاهُ وَإِنْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ