The Prophet (ﷺ) would say this dua:
اَللَّهُمَّ إِنِّي أَعُوْذُ بِكَ مِنْ شَرِّ مَا عَمِلْتُ، وَمِنْ شَرِّ مَا لَمْ أَعْمَلْ
Transliteration
Allaahumma, inni A‛oodhu bika min sharri maa 'amiltu, wa min sharri maa lam a'mal
Translation
I seek refuge in Thee from the evil of what I did and from the evil of what I did not.
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ، - وَاللَّفْظُ لِيَحْيَى - قَالاَ أَخْبَرَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ هِلاَلٍ، عَنْ فَرْوَةَ بْنِ نَوْفَلٍ الأَشْجَعِيِّ، قَالَ سَأَلْتُ عَائِشَةَ عَمَّا كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَدْعُو بِهِ اللَّهَ قَالَتْ كَانَ يَقُولُ " اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ شَرِّ مَا عَمِلْتُ وَمِنْ شَرِّ مَا لَمْ أَعْمَلْ " .
Translation
Farwa' b. Naufal Ashja'i reported: I asked: 'A'isha, in what words did Allah's Messenger (ﷺ) supplicate Allah? She said that he used to utter:" I seek refuge in Thee from the evil of what I did and from the evil of what I did not." [Muslim: 2716]
Surah Al-Falaq and Surah An-Nas protect from harm and jealousy. Ayat al-Kursi from Surah Al-Baqarah also keeps you safe from bad things.
A powerful dua says: O Allah, keep me safe from every side - front, back, right, left, and above. This protects you from all directions.
Say this: O Allah, protect me from them in any way You choose. This dua asks Allah to keep you safe from anyone trying to hurt you.
From Sunan Abi Dawud: O Allah, we put You between us and them, and we seek Your protection from their harm. Say this when you need safety from bad people.
Say this: O Allah, You are the Most Forgiving and love to forgive, so forgive me. Muslims use this dua in Ramadan and whenever they want forgiveness.