"Whenever the Messenger of Allah entered the toilet, he would say: 'A'udhu Billahi minal-khubthi wa'l-khaba'ith (I seek refuge with Allah from male and female devils).'" (Using translation from Ibn Mājah 298)  

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا دَخَلَ الْخَلَاءَ قَالَ «اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْخُبْثِ وَالْخَبَائِثِ»