Among the narrations which a Muslim should memorize and mention on a daily basis in order to be protected is:

 

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ʿUthmān b. ʿAffān raḍiallāhu ʿanh said: The Messenger of Allāh ṣāllallāhu ʿālayhi wa sallam stated: “There is no servant who says each day in the morning and evening:

بِسْمِ اللهِ الَّذِي لاَ يَضُرُّ مَعَ اسْمِهِ شَيْءٌ فِي الْأَرْضِ وَلاَ فِي السَّمَاءِ، وَهُوَ السَّمِيعُ العَلِيمُ

In the Name of Allāh, in Whose Name nothing can harm on the earth or in the heavens, and He is the All-Hearing, the All-Knowing.

3 times, except that he will not be afflicted with any harm.”²

Shaykh ‘Abd al-Razzāq al-‘Abbād ḥafthahullāh stated:

This is one of the tremendous supplications that a Muslim should regularly mention every morning and evening so that he may be protected – by the permission of Allāh – from being afflicted with unexpected harm, tragedy, or something similar.³

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²Sunan Abī Dāwūd, no. 5088 and al-Tirmithī, no. 3388. Shaykh al-Albānī graded it authentic in Ṣaḥīḥ al-Targhīb, no. 655.

³Fiqh al-Ad’iyah wal-Athkār, section 3, pg. 13.

Selected from: Supplications That Protect The Believer Against All Forms   of Harm (A Weapon Against The Recent Bout of Hate Crimes Against Muslims) page. 2, Compiled by Abū Isma’īl Muṣṭafá George DeBerry (حفظه الله).

For original, genuine & safe copy  see here: https://knowledgeofislamblog.wordpress.com/wp-content/uploads/2018/04/mustafa-george-supplications_that_protect_the_believer_against_all_types_of_harm.pdf

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Note: Added for the benefit of new muslims who cannot read Arabic:

بِسْمِ اللهِ الَّذِي لاَ يَضُرُّ مَعَ اسْمِهِ شَيْءٌ فِي الْأَرْضِ وَلاَ فِي السَّمَاءِ، وَهُوَ السَّمِيعُ العَلِيمُ

Bismillaahil-lathee laa yadhurru ma’asmihi shay’un fil-ardhi wa laa fis-samaa’i wa Huwas-Samee’ul-‘Aleem.

In the Name of Allāh, in Whose Name nothing can harm on the earth or in the heavens, and He is the All-Hearing, the All-Knowing.