Umm Salamah (RA) narrated that: When the Prophet (ﷺ) would leave his house, he would say:

بِسْمِ اللَّهِ تَوَكَّلْتُ عَلَى اللَّهِ اَللَّـهُمَّ إِنَّا نَعُوذُ بِكَ مِنْ أَنْ نَزِلَّ أَوْ نَضِلَّ أَوْ نَظْلِمَ أَوْ نُظْلَمَ أَوْ نَجْهَلَ أَوْ يُجْهَلَ عَلَيْنَا

Bismillaahi, tawakkaltu 'alal-laahi. Allaahumma, inna na`udhu bika min an nazilla aw nadilla, aw nazlima aw nuzlama, aw najhala aw yujhala 'alaina

In the Name of Allah, I place my trust in Allah. O Allah! We seek refuge in You from slipping unintentionally or becoming misguided, or committing oppression or being oppressed, or acting ignorantly or being treated ignorantly. A mu'min should recite these adhkar by his/her heart whenever (Day/Night) he/she goes outside.

Reference: Sahih (Albani). Tirmidhi: 3427