Musnad Ahmad 1153:2327

Ya'qub narrated to us, he said: My father narrated to us, from Muhammad ibn Ishaq, he said: Muhammad ibn Ja'far ibn al-Zubayr narrated to me, from 'Urwah ibn al-Zubayr, that 'Aishah narrated to him that he [the Prophet] said, when they said: "We feared that he might have pleurisy": "It is from Satan, and Allah would not give him power over me." Ibn Ishaq said: And Ibn Shihab said: 'Ubayd Allah ibn 'Abd Allah ibn 'Utbah narrated to me, from 'Aishah, she said: The Messenger of Allah, peace and blessings of Allah be upon him, I would often hear him say: "Allah does not take the soul of a prophet until He gives him the choice." She said: So when the Messenger of Allah, peace and blessings of Allah be upon him, was in his final moments, the last word I heard from him was him saying: "Rather, the Highest Companion from Paradise." She said: I said: "Then, by Allah, he will not choose us." And I knew that it was what he used to say to us: "A prophet is not taken until he is given the choice."