On page 17 of his booklet ‘Siyah Faam Ghulam’ [Dark-Skinned Slave], Shaykh-e-Tareeqat, Ameer-e-Ahl-e-Sunnat, the founder of Dawat-e-Islami, ‘Allamah Maulana Abu Bilal Muhammad Ilyas ‘Attar Qaadiri Razavi Ziyaee دَامَـتْ بَـرَكَـاتُـهُـمُ الْـعَـالِـيَـه has said: By the bestowal of Allah Almighty, the Holy Rasool صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم is also aware of the ages of his slaves as well as the things which are going to happen to them. There are many blessed Ayahs of the Holy Quran which give proof of the knowledge of Ghayb [unseen] of our Beloved Rasool صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم. In Ayah 24 of Surah At-Takweer, part 30 Allah Almighty has stated:

وَ مَا هُوَ عَلَى الْغَیْبِ بِضَنِیْنٍۚ(۲۴)

Translation from Kanz-ul-Iman: And this Nabi is not miserly upon the hidden.

(Part 30, Surah At-Takweer, Ayah 24)

And in Ayah 26 and 27 of Surah Al-Jinn, part 29 Allah Almighty has stated:

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

Translation from Kanz-ul-Iman: The All-Knowing of all the hidden does not give anyone the control over His secrets. Except to His chosen Noble Rusul.

(Part 29, Surah Al-Jinn, Ayah 26, 27)

‘Allamah Isma’eel Haqqi رَحْمَةُ اللهِ تَعَالٰی عَلَيْه has said that blessed commentators have said: Allah Almighty blesses His specific Rusul with specific knowledge of Ghayb. Whatever knowledge of Ghayb blessed saints رَحِمَهُمُ الـلّٰـهُ تَـعَالٰی get, they        get by the Wasilah [source] and blessings of blessed Ambiya عَـلَـيْهِمُ السَّلَام.

(Ruh-ul-Bayan, vol. 10, pp. 201)

Similarly, in Ayah 179 of Surah Aal-e-‘Imran, part 4, Allah عَزَّوَجَلَّ has stated:

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