Seeking refuge in Allah's might
أَعُوذُ بِعِزَّتِكَ الَّذِي لاَ إِلَهَ إِلاَّ أَنْتَ، الَّذِي لاَ يَمُوتُ وَالْجِنُّ وَالإِنْسُ يَمُوتُونَ
Transliteration
A'udhu bi-'izzatikal-ladhee laa ilaha illa Antal-ladhee laa yamootu, wal-jinnu wal-insu yamootoon.
Translation
I seek refuge (with YOU) by Your 'Izzat, None has the right to be worshipped but You Who does not die while the Jinns and the human beings die
How
The Prophet used to say this.
Source: Sahih al-Bukhari 7383. Full details