Mishkat al-Masabih
Mishkat al-Masabih 388
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
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
ʿĀʾisha said: ‘The Messenger of God was using the tooth-stick while two men were with him, one older than the other. Revelation came to him about the merit of the tooth-stick, instructing him: “Honor the elder and give the tooth-stick to the older of the two.”’ Abū Dāwūd transmitted it.
Notes and open questions — unreviewed
The accompanying grading labels this report ṣaḥīḥ (sound). The Arabic explicitly links the instruction to honoring the older man while giving him the tooth-stick.