Bismillāhi ‘l-ladhī lā yaḍurru ma`a-smihi
shay'un fil-'arḍi wa lā fis-samā'
wa huwas-Samī `ul-`Alīm.
In the Name of Allah, Who with His Name nothing can cause harm in the earth nor in the heavens,
and He is the All-Hearing, the All-Knowing. (Recite three times in Arabic).
Reference:
"Whoever recites it three times in the morning will not be afflicted by any
calamity before evening, and whoever recites it three times in the evening
will not be overtaken by any calamity before morning." Abu Dawud 4/323,
At-Tirmidhi 5/465, Ibn Majah 2/332, Ahmad. Ibn Majah's chain of
transmission is good (Hasan), Ibn Baz, p. 39.