Surah Al-Anbya 21:104

يَوْمَ نَطْوِى ٱلسَّمَآءَ كَطَىِّ ٱلسِّجِلِّ لِلْكُتُبِ ۚ كَمَا بَدَأْنَآ أَوَّلَ خَلْقٍ نُّعِيدُهُۥ ۚ وَعْدًا عَلَيْنَآ ۚ إِنَّا كُنَّا فَـٰعِلِينَ

The Day when We will fold the heaven like the folding of a [written] sheet for the records. As We began the first creation, We will repeat it. [That is] a promise binding upon Us. Indeed, We will do it.

Translation: Saheeh International

Tafsir

The day yawma is in the accusative because of an implied preceding udhkur ‘mention’ when We shall roll up the heaven as the Scribe al-sijill being the name of an angel rolls up the written scroll that is the scroll of the son of Adam when he dies the lām of li’l-kitāb is extra; …

Excerpt from Tafsir al-Jalalayn, commentary on 21:104, via Quran.com. The reader has the full commentary and 9 more tafsirs.