اتَّقِ اللَّهِ حَيْثُمَا كُنْتَ وَأَتْبِعْ السَّيِّئَةَ الْحَسَنَةَ تَمْحُهَا وَخَالِقِ النَّاسَ بِخُلُقٍ حَسَنٍ

Be mindful of Allah wherever you are, follow a bad deed with a good deed and it will erase it, and behave with good character toward people.

Source: Sunan At-Tirmidhi 1987