بِسْـمِ الله
اللَّهُـمَّ إِنِّـي أَعُـوْذُ بِـكَ مِـنَ الْخُـبْثِ وَالْخَـبَائِث
[Bismillāhi] Allāhumma 'innī 'a`ūdhu bika minal-khubthi walkhabā'ith.
Translation
In the name of Allah
O Allah, I take refuge with You from all evil and evil-doers.
When to recite
Before entering the toilet.
Source / Reference
Hisnul Muslim 10