Mishkat al-Masabih #332
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ زَيْدِ بْنِ أَرْقَمَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:
" إِنَّ هَذِهِ الْحُشُوشَ مُحْتَضَرَةٌ فَإِذَا أَتَى أَحَدُكُمُ الْخَلَاءَ فَلْيَقُلْ: أَعُوذُ بِاللَّهِ مِنَ الْخُبْثِ والخبائث ". رَوَاهُ أَبُو دَاوُد وَابْن مَاجَه
Zaid b. Arqam reported God's messenger as saying, "These privies are peopled by jinn and devils, so when one of you goes there he should say, ‘I seek refuge in God from male and female devils.”
Abu Dawud and Ibn Majah transmitted it.
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About Mishkat al-Masabih
This hadith is #332 from Mishkat al-Masabih, in the Book of Purification.