How does nārun ḥāmiyah relate to the preceding mā adrāka mā hiyah?

Supplementary Practice 26 — Comparative Rhetoric of Sūrat al-Qāriʿah and Sūrat al-Tīn

• It gives a concise, decisive clarification of the preceding question
• It negates the preceding verse
• It is an imperative form of the earlier question
• It is an object of oath after wāw