Sayyidah Aishah (may Allah be pleased with her) related: On that day, when the Messenger of Allah (peace and blessings be upon him) returned from the mosque, he (peace and blessings be upon him) felt pain and lay down in my lap. Then a man from the family of Abu Bakr (may Allah be pleased with him) came in to me with a green (fresh) miswak in his hand. She said: The Messenger of Allah (peace and blessings be upon him) looked (intently) at his hand, and I knew that he (peace and blessings be upon him) wanted it, so I said: O Messenger of Allah, would you like me to give you this miswak? He (peace and blessings be upon him) said: "Yes." I took it and chewed it for him (peace and blessings be upon him) until I had softened it, then gave it to him (peace and blessings be upon him), and he (peace and blessings be upon him) cleaned his teeth with it more vigorously than I had ever seen him (peace and blessings be upon him) use a miswak before. Then he put it down. After that I felt the Messenger of Allah (peace and blessings be upon him) growing heavy in my lap, so I looked at his (peace and blessings be upon him) face, and his (peace and blessings be upon him) gaze had become fixed, and he (peace and blessings be upon him) was saying: "Rather, the Highest Companion of Paradise." So I said: By the One who sent you with the truth, you were given the choice and you chose (it). Sayyidah Aishah (may Allah be pleased with her) said: And the Messenger of Allah (peace and blessings be upon him) passed away.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19385