Surah An-Naba 78:7

وَٱلْجِبَالَ أَوْتَادًا

And the mountains as stakes?

Translation: Saheeh International

Tafsir

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.

Excerpt from Tafsir al-Jalalayn, commentary on 78:7, via Quran.com. The reader has the full commentary and 9 more tafsirs.