Reference : Hisn al-Muslim 216

أَعـوذُ بِكَلِـماتِ اللّهِ التّـامّاتِ مِنْ شَـرِّ ما خَلَـق
A`ūdhu bikalimāti ‘llāhit-tāmmāti min sharri mā khalaq.

I seek refuge in the Perfect Words of Allah from the evil of what He has created.

Reference:
Muslim 4/2080.

Chapter: Stopping or lodging somewhere in travel and otherwise