(9) باب مَنْ تَسَوَّكَ بِسِوَاكِ غَيْرِهِ
Narrated `Aisha:
`Abdur-Rahman bin Abi Bakr came holding a Siwak with which he was cleaning his teeth. Allah's Apostle looked at him. I requested `Abdur-Rahman to give the Siwak to me and after he gave it to me I divided it, chewed it and gave it to Allah's Messenger (ﷺ). Then he cleaned his teeth with it and (at that time) he was resting against my chest.
Reference: Sahih al-Bukhari 890
In-book reference: Book 11, Hadith 15
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 13, Hadith 15