سُبْحَانَ اللَّهِ وَبِحَمْدِهِ، أَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ
Subhanallahi wa bihamdihi, astaghfirullaha wa atubu ilayh
سبحان الله وبحمده، أستغفر الله وأتوب إليه
Recite frequently or after gatherings
The Prophet (PBUH) would say this when getting up from a gathering, and Aisha (RA) noted he said it often after Surah An-Nasr was revealed.