Surah Al-Qiyamah 75:1
لَآ أُقْسِمُ بِيَوْمِ ٱلْقِيَـٰمَةِ
I swear by the Day of Resurrection
Translation: Saheeh International
Tafsir
Nay! the lā is extra in both instances I swear by the Day of Resurrection.
Excerpt from Tafsir al-Jalalayn, commentary on 75:1, via Quran.com. The reader has the full commentary and 9 more tafsirs.