Muwatta Malik, Book 54, Hadith 1800 (In-Book) ⓘ

Malik related to me from a reliable source of his from Yaqub ibn Abdullah al-Ashajj from Bushr ibn Said from Sad ibn Abi Waqqas from Khawla bint Hakim that the Messenger of Allah, may Allah bless him and grant him peace, said, "Whoever dismounts to rest in a place should say, 'I seek refuge with the complete words of Allah from the evil of what he created,' (audhu bi kalimati-llahi at-tammati min sharri ma khalaqa), and nothing will harm him until he remounts."

وَحَدَّثَنِي مَالِكٌ، عَنِ الثِّقَةِ، عِنْدَهُ عَنْ يَعْقُوبَ بْنِ عَبْدِ اللَّهِ بْنِ الأَشَجِّ، عَنْ بُسْرِ بْنِ سَعِيدٍ، عَنْ سَعْدِ بْنِ أَبِي وَقَّاصٍ، عَنْ خَوْلَةَ بِنْتِ حَكِيمٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ مَنْ نَزَلَ مَنْزِلاً فَلْيَقُلْ أَعُوذُ بِكَلِمَاتِ اللَّهِ التَّامَّاتِ مِنْ شَرِّ مَا خَلَقَ ‏.‏ فَإِنَّهُ لَنْ يَضُرَّهُ شَىْءٌ حَتَّى يَرْتَحِلَ ‏" ‏ ‏.‏