Dr. Mustafa Khattab, the Clear Quran - Surah An-Naba, ayah 7

Translation of Surah An-Naba, ayah 7 (78:7)

وَٱلۡجِبَالَ أَوۡتَادٗا ٧
and ˹made˺ the mountains as ˹its˺ pegs,1

Foot notes

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Just like tent pegs and icebergs, mountains go deep below the surface, slowing tectonic movement.