Sunan Abi Dawud 52
سنن أبي داود#52HasanAishah narrated:"The Prophet of Allah (ﷺ) would clean his teeth with the Siwak, then he would give me the Siwak in order to wash it. So I would first use it myself, then wash it and return it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan
Muhammad Muhyi Al-Din Abdul HamidHasan
Shuaib Al ArnautHasan
Zubair Ali ZaiIsnaad Hasan
In-book reference: 1:52