يَدَا أَبِي لَهَبٍ
Abu Lahab’s two hands. (111:1)
Yadā is dual, nominative by alif, and in construct; abī is genitive by yāʾ as a five-noun form and is itself a construct; lahab is its genitive complement. The dual ending should not be confused with singular or plural morphology.
'Hands' may denote the physical members or serve as a metonym for actions and capacity. The rhetoric of mentioning the hands before the man can be examined through metonymy or indirect indication, while the syntactic subject remains yadā.