Tafsir al-Jalalayn — an-Naba 78:7

and the mountains pegs? with which the earth is tied down like tents are tied down with pegs the interrogative is meant as an affirmative.

Tafsir al-Jalalayn — an-Naba 78:2

About the awesome tiding this is the explication of that ‘thing’; the interrogative is meant to emphasise its magnitude — this awesome tiding is the Qur’ān comprising news of the Resurrection and so on which the Prophet s brought —