وَجَآءَ رَبُّكَ وَٱلْمَلَكُ صَفًّۭا صَفًّۭا
Sentence structure
جَآءَ is a perfect verb with رَبُّكَ as subject. وَٱلْمَلَكُ is coordinated as another subject, while both instances of صَفًّۭا are circumstantial accusatives.
Ayah summary
The Lord's majestic manifestation, befitting His glory, will appear, and the angels will come rank upon rank.
وَجَآءَ — And comes
Grammar: وَ coordinates; جَآءَ is a third-person masculine-singular perfect used in the future scene.
رَبُّكَ — your Lord
Grammar: رَبُّ is the nominative subject of جَآءَ; attached كَ is a genitive possessor.
وَٱلْمَلَكُ — and the Angels
Grammar: وَ coordinates and ٱلْمَلَكُ is a definite nominative noun coordinated with the subject.
صَفًّۭا — rank
Grammar: An indefinite masculine circumstantial accusative describing the manner of the angels' arrival.
صَفًّۭا — (upon) rank
Grammar: A second indefinite masculine circumstantial accusative, coordinated/repeated with the first.