Beloved Prophet صَلَّى اللهُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم, by the bestowment of his Lord Almighty, also knows about the lifespans of his slaves and what will happen to them. One can find proof of the knowledge of the unseen of the Holy Prophet صَلَّى اللهُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم in many blessed verses of the Holy Qur`an. In this regard, it is stated by Allah Almighty in Part 30, verse 24 of Surah Al-Takweer,

وَ مَا هُوَ عَلَى الْغَیْبِ بِضَنِیْنٍۚ(۲۴)

And this Prophet is not miserly in revealing the (knowledge of the) unseen.

[Kanz-ul-Iman (Translation of Quran)] (Part 30, Surah Al-Takweer, verse 24)

It is stated by Allah Almighty in Part 29, verse number 26 and 27 of Surah Jinn,

عٰلِمُ الْغَیْبِ فَلَا یُظْهِرُ عَلٰى غَیْبِهٖۤ اَحَدًاۙ(۲۶) اِلَّا مَنِ ارْتَضٰى مِنْ رَّسُوْلٍ

(Allah is) The Knower of the unseen; He does not completely disclose His (knowledge of the) unseen to anyone. Except to His chosen Messengers;

[Kanz-ul-Iman (Translation of Quran)] (Part 29, Surah Al-Jinn, verses 26-27)

Likewise, it is stated in the Holy Qur`an in Part 4, verse number 179 of Surah Aal-e-‘Imran,

وَ  مَا  كَانَ  اللّٰهُ  لِیُطْلِعَكُمْ  عَلَى  الْغَیْبِ  وَ  لٰكِنَّ  اللّٰهَ  یَجْتَبِیْ  مِنْ  رُّسُلِهٖ  مَنْ  یَّشَآءُ   ۪-   

And it does not befit the Dignity of Allah to give you, O common people, Knowledge of the unseen. Yes; Allah chooses from His Messengers whom He wills (to grant the Knowledge of the unseen).

[Kanz-ul-Iman (Translation of Quran)] (Part 4, Surah Aal-e-‘Imran, verse 179)

Sayyiduna Mu’aaz Bin Jabal رَضِىَ اللّٰهُ عَـنْهُ mentions that the Noble Prophet صَلَّى اللهُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم stated, ‘I saw my Lord Almighty, He placed a Manifestation of His Power between my shoulders, its coolness was felt in my chest, everything became clear to me at that time and I recognised everything.’ (Tirmidi, vol. 5, p. 160, Hadees 3246)