Ayesha reported,

Aishah reported that the Prophet ﷺ used to say while he was in good health, "No prophet's soul is taken until he is shown his place in Paradise, and then he is given the choice."When his final illness came upon him and his head was resting on my thigh, he lost consciousness for a while, then he came to. He fixed his gaze upward toward the ceiling of the room and said, "O Allah, the Highest Companion."I said to myself, "Then he is not choosing to remain with us." And I realized that this was the very saying he used to tell us about when he was healthy.She said, "His final words were, 'O Allah, the Highest Companion.'"

عن عائشة قالت

كان النبي ﷺ يقول- وهو صحيح-: إنه لم يقبض نبي حتى يرى مقعده من الجنة، ثم يخير فلما نزل به ورأسه على فخذي غشي عليه، ثم أفاق فأشخص بصره إلى سقف البيت، ثم قال: اللهم الرفيق الأعلى. فقلت: إذا لا يختارنا، وعرفت أنه الحديث الذي كان يحدثنا وهو صحيح. قالت: فكانت آخر كلمة تكلم بها: اللهم الرفيق الأعلى.