Whoever recites this three times in the morning will not be afflicted by any calamity before evening. And whoever recites this three times in the evening will not be afflicted by any calamity before morning.
[Tirmidhi, Abu Dawud]
Bismil-lahil-lathee la yadurru ma‘as-mihi shay-on fil-ardi wala fis-sama-i wahuwas-samee‘ul-‘aleem.
Translation of the Meaning:
In the name of Allah with whose name nothing is harmed on earth nor in the heavens and He is The All-Seeing, The All-Knowing. (three times)
[Abu Dawood 4/323, Saheeh Ibn Maajah 2/332]