When the Apostle of Allaah (sal Allahu alayhi wa sallam) entered the toilet, he used to say (before entering): "O Allaah, I seek refuge in Thee." This is according to the version of Hammad. 'Abd al-Warith has another version :"I seek refuge in Allaah from male and female devils."  

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا دَخَلَ الْخَلاَءَ قَالَ عَنْ حَمَّادٍ قَالَ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ وَقَالَ عَنْ عَبْدِ الْوَارِثِ قَالَ أَعُوذُ بِاللَّهِ مِنَ الْخُبُثِ وَالْخَبَائِثِ قَالَ أَبُو دَاوُد رَوَاهُ شُعْبَةُ عَنْ عَبْدِ الْعَزِيزِ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ وَقَالَ مَرَّةً أَعُوذُ بِاللَّهِ و قَالَ وُهَيْبٌ فَلْيَتَعَوَّذْ بِاللَّهِ  

" O Allaah, I seek refuge in Thee." Shu'bah said: Anas sometimes reported the words: "I take refuge in Allah."  

اللَّهُمَّ إِنِّي أَعُوذُ بِكَ وَقَالَ شُعْبَةُ وَقَالَ مَرَّةً أَعُوذُ بِاللَّهِ  

The Messenger of Allah ﷺ said: These privies are frequented by the jinns and devils. So when anyone amongst you goes there, he should say: "I seek refuge in Allah from male and female devils."  

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ إِنَّ هَذِهِ الْحُشُوشَ مُحْتَضَرَةٌ فَإِذَا أَتَى أَحَدُكُمُ الْخَلاَءَ فَلْيَقُلْ أَعُوذُ بِاللَّهِ مِنَ الْخُبُثِ وَالْخَبَائِثِ