عَنِ ٱلنَّبَإِ ٱلْعَظِيمِ
Sentence structure
This phrase clarifies the topic and prepositional complement of their questioning: the great news. ٱلْعَظِيمِ follows ٱلنَّبَإِ as its adjective, agreeing with it in definiteness, gender, number, and case.
عَنِ — about
Grammar: A preposition. Its final kasrah eases pronunciation before the following word beginning with hamzat al-waṣl.
ٱلنَّبَإِ — the news
Grammar: ٱلْ is the definite article. نَّبَإِ is a masculine singular noun made genitive by عَنِ.
ٱلْعَظِيمِ — the great
Grammar: A definite masculine singular adjective, genitive because it describes the genitive noun ٱلنَّبَإِ.