When the Prophet [SAW] went out of his house, he said :

Bismillahi Rabbi. A'udhu bika min an azilla aw adhilla aw adhlima aw udhlama, aw ajhala aw yujhala 'alayya

بِسْمِ اللهِ رَبّ أَعُعْوذُ بِكَ مِنْ أَنْ أَزِلَّ أَوْ أَضِلَّ أَوْ أَظْلِمَ أَوْ أُظْلَمَ أَوْ أَجْهَلَ أَوْ يُجْهَلَ لََيَّ

Meaning:
O Allah! I seek refuge in thee lest I stray or be led astray, or slip or made to slip, or cause injustice, or suffer injustice, or do wrong, or have wrong done to me.

(Book: Nasa'i 5391, 5444)