Mishkat al-Masabih #350
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن شُرَيْح بن هَانِئ قَالَ: سَأَلْتُ عَائِشَةَ: بِأَيِّ شَيْءٍ كَانَ يَبْدَأُ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا دخل بَيته؟ قَالَت: بِالسِّوَاكِ. رَوَاهُ مُسلم
Shuraih b. Hani’ said that he asked ‘A'isha what God’s messenger did first when he entered his house, and she replied that he used the tooth-stick.
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #350 from Mishkat al-Masabih, in the Book of Purification.