حَدَّثَنَا عَمْرُو بْنُ رَافِعٍ، حَدَّثَنَا إِسْمَاعِيلُ ابْنُ عُلَيَّةَ، عَنْ عَبْدِ الْعَزِيزِ بْنِ صُهَيْبٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ إِذَا دَخَلَ الْخَلاَءَ قَالَ ‏"‏ أَعُوذُ بِاللَّهِ مِنَ الْخُبُثِ وَالْخَبَائِثِ ‏"‏ ‏.‏

It was narrated that Anas bin Malik said: "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).'" Translation Not Available

Book Ref: Sunan Ibn Majah Book 1 Hadith 298
Web Ref:  Sunan Ibn Majah Vol 1 Book 1 Hadith 298