Du'a of Protection from Sudden Calamities and All Harm

Read 3 times morning and evening

بِسْمِ اللَّهِ الَّذِي لَا يَضُرُّ مَعَ اسْمِهِ شَيْءٌ فِي الْأَرْضِ وَلَا فِي السَّمَاءِ وَهُوَ السَّمِيعُ الْعَلِيمُ

We have made (started) the morning (and night) in whose Name nothing in the skies and the earth can harm and He is the All-hearing, the All-knowing.

(Tirmidhi)