Abū Dāwūd, al-Tirmidhī, and others narrated from ʿUthmān ibn ʿAffān, may Allāh be pleased with him, that he said: “The Messenger of Allāh (ﷺ) said:

There is not a slave who says every morning [before sunrise] and [every] late afternoon [before sunset]—

بِسْمِ اللهِ الّذِي لاَ يَضُرُّ مَعَ اسْمِهِ شَيْءٌ فِي الأَرْضِ وَلاَ فِي السَّمَاءِ وَهُوَ السَّمِيعُ العَلِيمُ

Bismillāhi-lladhī lā yaḍurru maʿa-smihi shayʾun fi-l-ʿarḍi wa lā fi-l-samāʾi wa huwa-l-Samīʿu al-ʿAlīmu

—three times, [except that] nothing would come to harm him.¹

Meaning:

[I seek refuge] in the name of Allāh, the One who, [when refuge is sought] with His name, nothing from the Heavens nor from the Earth can bring about harm, and He is the All-Hearing, the All-Knowing.

¹Abū Dāwūd, no. 5088; al-Tirmidhī, no. 3388; see Ṣaḥīḥ Jāmiʿ al-Ṣaghīr, no. 6426.