Dua

Bismillahilladhi la yadurru

بِسْمِ اللَّهِ الَّذِي لَا يَضُرُّ مَعَ اسْمِهِ شَيْءٌ فِي الأَرْضِ وَلاَ فِي السَّمَاءِ وَهُوَ السَّمِيعُ الْعَلِيمُ

Bismillahilladhi la yadurru ma'asmihi shay'un fil-ardi wa la fis-sama'i wa huwas-sami'ul-'alim

In the name of Allah, with whose name nothing on earth or in heaven can cause harm; and He is the All-Hearing, the All-Knowing.

Target
7x
Guidance
Three times in the morning and three times in the evening — the count and times come from the narration itself.
Source
জামে তিরমিজী; Sunan Abi Dawud 3388; 5088
Narrator: Uthman (ra). Tirmidhi 3388: Hasan (Darussalam); Abu Dawud 5088: Sahih (Al-Albani). The narration states the one who says it three times morning/evening will not be struck by sudden affliction.
Do it as a Challenge