(3) Purification
كتاب الطهارة
(4c) Chapter: The tooth-stick - Section 3
(3) باب السواك - الفصل الثالث
Mishkat al-Masabih 388 
‘A'isha said that God’s messenger was using the tooth-stick when two men, one older than the other, were with him. A revelation came to him about the excellence of the tooth-stick in which he was told to show proper respect, and give it to the older of the two. Abu Dawud transmitted it.
وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَسْتَنُّ وَعِنْدَهُ رَجُلَانِ أَحَدُهُمَا أَكْبَرُ مِنَ الْآخَرِ فَأُوحِيَ إِلَيْهِ فِي فَضْلِ السِّوَاكِ أَنْ كَبِّرْ أَعْطِ السِّوَاك أكبرهما. رَوَاهُ أَبُو دَاوُد
 صَحِيحٌ  (الألباني)حكم :
Reference : Mishkat al-Masabih 388
In-book reference : Book 3, Hadith 97