Authentic Supplication Number 200.

The Messenger of Allah  said: Whoever takes a lodging place for himself then let him say: 'A`outhu bikalimatil-lahi 'at-tammati min sharri ma khalaqa (219), nothing would harm him until he would depart from that place.

Footnotes.
(219)I seek refuge in the complete and perfect words of Allah from the evil of what He has created.

Reporters.
Reported by Muslim, and is #142 in The Authentic of Good Sayings.