يَشْهَدُهُ ٱلْمُقَرَّبُونَ
Sentence structure
The verbal clause is a second adjective for كِتَـٰبٌ. Attached هُ is the object of يَشْهَدُ, while ٱلْمُقَرَّبُونَ is its subject.
Ayah summary
Those brought near witness this record and are present at that station.
يَشْهَدُهُ — Witness it
Grammar: A third-person masculine-singular imperfect in a clause describing كِتَـٰبٌ; attached هُ is its object.
ٱلْمُقَرَّبُونَ — those brought near
Grammar: A definite Form II masculine-plural passive participle functioning as the subject of يَشْهَدُ, nominative with wāw; final nūn is nominal.