In the morning or evening, say -

اَللَّهُمَّ عَالِمَ الْغَيْبِ وَالشَّهَادَةِ فَاطِرَ السَّمَوَاتِ وَالْأَرْضِ، رَبَّ كُلِّ شَيْءٍ وَمَلِيكَهُ، أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا أَنْتَ، أَعُوْذُ بِكَ مِنْ شَرِّ نَفْسِي، وَمِنْ شَرِّ الشَّيْطَانِ وَشِرْكِهِ ، وَأَنْ أَقْتَرِفَ عَلَى نَفْسِي سُوْءًا، أَوْ أَجُرَّهُ إِلَى مُسْلِمٍ

Allaahumma 'Aalimal-ghaybi wash-shahaadati faatiras-samaawaati wal'ardhi, Rabba kulli shay'in wa maleekahu, 'ash-hadu 'an laa 'ilaaha 'illaa 'Anta, 'A'oodhu bika min sharri nafsee, wa min sharrish-shaytaani wa shirkihi, wa 'an 'aqtarifa 'alaa nafsee soo'an, 'aw 'ajurrahu 'ilaa Muslim.

O Allah, Knower of the unseen and the seen, Creator of the heavens and the Earth, Lord and Sovereign of all things, I bear witness that none has the right to be worshipped except You. I take refuge in You from the evil of my soul and from the evil and shirk of the devil, and from committing wrong against my soul or bringing such upon another Muslim. Abu Bakr As-Siddiq (RA) said: “O Messenger of Allah, teach me what to say at morning and afternoon.” He said: “O Abu Bakr, say (above dua)

Reference: Sahih (Albani). Tirmidhi: 3529