Riyad us Saliheen: Hadith 1456

The Messenger of Allah (ﷺ) said, "He who recites three times every morning and evening: 'Bismillahil-ladhi la yadurru ma'as-mihi shai'un fil-ardi wa la fis-sama'i, wa Huwas-Sami'ul-'Alim (In the Name of Allah with Whose Name there is protection against every kind of harm in the earth or in the heaven, and He is the All-Hearing and All- Knowing),' nothing will harm him."

[Abu Dawud and At- Tirmidhi].