Academic approach introduced - Teacher and universal Text-Book.
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Thereby, it was obviously not commensurate with the status and unique glory of being the Universal Messenger until the anchoring of the appointed Moment of the Last Day of the Earthly universe.
وَقَالُوا۟ لَوْلَآ أُنزِلَ عَلَيْهِ ءَايَٟتٚ مِّن رَّبِّهِۦۖ
And they/ruling elite said to people, "Why unprecedented displays, as were given to earlier Messengers, not been sent to him from his Sustainer Lord?"
قُلْ إِنَّمَا ٱلْءَايَٟتُ عِندَ ٱللَّهِ
You the Messenger pronounce for public information, "the unprecedented displays - signs are displayed only by the permission of Allah the Exalted —
وَإِنَّمَآ أَنَا۟ نَذِيرٚ مُّبِيـنٌ .٥٠
And I am but to act as Manifest Warner -Revivalist -Admonisher."
The universality and permanence of the Messenger-ship necessitates that academic and scientific approach be made the base for learning the divine guidance by the Humanity and Species Jinn, while demonstrative signs indicating the Divine Providence are already all around as ءَايَٟتِهِۦ His Signs for reflection and visualization
أَوَلَمْ يَكْفِهِـمْ أَنَّـآ أَنزَلْنَا عَلَيْكَ ٱلْـكِـتَٟبَ يُتْلَـىٰ عَلَيْـهِـمْۚ
You confirm it, has it not sufficed for them as irrefutable primary evidence of you being universal Messenger that Our Majesty have since sent upon you the Messenger compositely the Book (Qur’ān) which is recited to them, word by word?
إِنَّ فِـى ذَٟلِكَ لَرَحْـمَةٙ
Know the fact, indeed prelude to blessed life is explicitly elaborated in it —
وَذِكْرَىٰ لِقَوْمٛ يُؤْمِنُونَ .٥١
And for frequenting to obtain advice and guidance the memoir from eternity to eternity are incorporated therein especially for those who truly believe in the Messenger Muhammad .
The academic rules and principles of learning by instruction are universal. The Divine Book titled Qur’ān is declared as the Text-Book for Guidance in space-time irrespective of national and linguistic boundaries. This is the only Divine Book that was delivered to people in smaller chunks, orally and in writing, over a period of 23 years when it was composed and organized in the formal format of bound book as promised by Allah the Exalted during the days of its intermittent revelation.
Allah the Exalted in fact turned the world into a global academy by appointment of the Universal Messenger. We need to have a teacher for learning by instruction. Allah the Exalted assigning him the role and status of the Teacher to teach exclusively the Text Book, Qur’ān which was firstly taught to him
ٱلرَّحْـمَـٰنُ .١
عَلَّمَ ٱلْقُرْءَانَ .٢
Be informed; Ar'Reh'maan, He the Exalted has taught the Qur’ān to the elevated Messenger (Muhammad Sal'lallaa'hoalaih'wa'salam)