Mishkat al-Masabih
Mishkat al-Masabih 381
عَنْ عَائِشَةَ قَالَتْ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «السِّوَاكُ مَطْهَرَةٌ لِلْفَمِ مَرْضَاةٌ لِلرَّبِّ» . رَوَاهُ الشَّافِعِيُّ وَأَحْمَدُ وَالدَّارِمِيُّ وَالنَّسَائِيُّ وَرَوَاهُ البُخَارِيّ فِي صَحِيحه بِلَا إِسْنَاد
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
ʿĀʾisha reported that the Messenger of God said: ‘The tooth-stick purifies the mouth and pleases the Lord.’ Al-Shāfiʿī, Aḥmad, al-Dārimī, and al-Nasāʾī transmitted it. Al-Bukhārī included it in his Ṣaḥīḥ without a chain of transmission.
Notes and open questions — unreviewed
The accompanying grading labels this report ṣaḥīḥ (sound). The source notes that al-Bukhārī included the wording without an isnād.