The Prophet (ﷺ) said, A person who says 100 times a day -

سُبْحَانَ اللَّهِ وَبِحَمْدِهِ

SubhaanAllahi wa bihamdihi

Glorified is Allah and praised is He. The Prophet (ﷺ) said, A person who says 100 times a day (dua mentioned above) It will be forgiven all his sins even if they were as much as the foam of the sea.

Reference: Bukhari: 6405