When you stop somewhere unfamiliar
Whoever says it, nothing will harm him until he moves on from that place.
مَنْ نَزَلَ مَنْزِلاً ثُمَّ قَالَ أَعُوذُ بِكَلِمَاتِ اللَّهِ التَّامَّاتِ مِنْ شَرِّ مَا خَلَقَ . لَمْ يَضُرُّهُ شَىْءٌ حَتَّى يَرْتَحِلَ مِنْ مَنْزِلِهِ ذَلِكَ
Aʿūdhu bi-kalimāti-llāhi-t-tāmmāti min sharri mā khalaq.
“I seek refuge in the perfect words of Allah from the evil of what He has created.”
The full narration
Khaula bint Hakim Sulamiyya reported:I heard Allah's Messenger (ﷺ) as saying: When anyone lands at a place, and then says:" I seek refuge in the Perfect Word of Allah from the evil of what He has created," nothing would harm him until he marches from that stopping place
Source
Ṣaḥīḥ Muslim · 6878
Ṣaḥīḥ
- Agreed upon as authentic (al-Bukhārī / Muslim)