Surah Al-Mulk 67:4

ثُمَّ ٱرْجِعِ ٱلْبَصَرَ كَرَّتَيْنِ يَنقَلِبْ إِلَيْكَ ٱلْبَصَرُ خَاسِئًا وَهُوَ حَسِيرٌ

Then return [your] vision twice again. [Your] vision will return to you humbled while it is fatigued.

Translation: Saheeh International

Tafsir

Then cast your eyes yet again once and then twice and your sight will return to you humbled abject on account of it not perceiving any fissure and wearied unable to see any fissure.

Excerpt from Tafsir al-Jalalayn, commentary on 67:4, via Quran.com. The reader has the full commentary and 9 more tafsirs.