.بِسْمِ اللَّهِ الَّذِي لَا يَضُرُّ مَعَ اسْمِهِ شَيْءٌ فِي الَْأرْضِ وَلَا فِي السَّمَاءِ وَهُوَ السَّمِيعُ الْعَلِيمُ
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. (Read three times)
(Whoever recites it in the morning will not be afflicted by any calamity before evening, and whoever recites it in the evening will not be overtaken by any calamity before morning.)
Abu Dawud 4/323, At-Tirmizi 5/465, Ibn Majah 2/332, Ahmad.