أَخْبَرَنَا عَلِيُّ بْنُ خَشْرَمٍ، قَالَ حَدَّثَنَا عِيسَى، - وَهُوَ ابْنُ يُونُسَ - عَنْ مِسْعَرٍ، عَنِ الْمِقْدَامِ، - وَهُوَ ابْنُ شُرَيْحٍ - عَنْ أَبِيهِ، قَالَ قُلْتُ لِعَائِشَةَ بِأَىِّ شَىْءٍ كَانَ يَبْدَأُ النَّبِيُّ صلى الله عليه وسلم إِذَا دَخَلَ بَيْتَهُ قَالَتْ بِالسِّوَاكِ ‏.‏

It was narrated from Al-Miqdam - Abu Shuraih - that his father said: "I said to 'Aishah: 'What did the Prophet (PBUH) start with when he entered his house?' She said: 'The Siwak.'" Translation Not Available

Book Ref: Sunan An Nisai Book 1 Hadith 8
Web Ref:  Sunan An Nisai Vol 1 Book 1 Hadith 8

---