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).
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.