لا تحتاج كل آية إلى سبب النزول
Not every verse requires a particular occasion of revelation to be understood.
Some Qur'anic teachings are expressed as general guidance, belief, rulings or exhortation. Their basic meaning can be understood through language, composition and other evidence even where no specific occasion is reported.
For other passages, knowledge of a reliably established event helps—and can sometimes be necessary—to identify a reference, audience or circumstance. The sound principle is neither to ignore occasions altogether nor to invent an event for every verse.