Ayesha reported,

Abdul-Rahman bin Abu Bakr came in to see the Prophet ﷺ while I was supporting him against my chest. Abdul-Rahman had with him a fresh siwak which he was using to clean his teeth. The Messenger of Allah ﷺ fixed his gaze upon it, so I took the siwak, broke off the end, shook it out, softened it, and handed it to the Prophet ﷺ. He cleaned his teeth with it, and I never saw the Messenger of Allah ﷺ clean his teeth more thoroughly than he did then.When the Messenger of Allah ﷺ finished, he raised his hand, or his finger, and said three times, "With the highest companions," then he passed away.She used to say, "He died between my throat and my chin."

Bukhari 4438

Sahih

حدثنا محمد حدثنا عفان عن صخر بن جويرية عن عبد الرحمن بن القاسم عن أبيه

عن عائشة

دخل عبد الرحمن بن أبي بكر على النبي ﷺ وأنا مسندته إلى صدري ومع عبد الرحمن سواك رطب يستن به فأبده رسول الله ﷺ بصره فأخذت السواك فقصمته ونفضته وطيبته ثم دفعته إلى النبي ﷺ فاستن به فما رأيت رسول الله ﷺ استن استنانا قط أحسن منه فما عدا أن فرغ رسول الله ﷺ رفع يده أو إصبعه ثم قال في الرفيق الأعلى ثلاثا ثم قضى وكانت تقول مات بين حاقنتي وذاقنتي

البخاري 4438صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Expeditions
Chapter
Illness of the Prophet ﷺ and his death
Numbering
Darussalam 4438
Bukhari 4438