From Sahih Bukhari (Hadith 142):
Narrated Anas:Whenever the Prophet (ﷺ) went to answer the call of nature, he used to say, "Allah-umma inni a`udhu bika minal khubuthi wal khaba'ith i.e. O Allah, I seek Refuge with You from all offensive and wicked things (evil deeds and evil spirits)
Reference: Bukhari 142