Surah Ad-Dukhan 44:3

إِنَّآ أَنزَلْنَـٰهُ فِى لَيْلَةٍ مُّبَـٰرَكَةٍ ۚ إِنَّا كُنَّا مُنذِرِينَ

Indeed, We sent it down during a blessed night. Indeed, We were to warn [mankind].

Translation: Saheeh International

Tafsir

Indeed We revealed it on a blessed night the Night of Ordainment laylat al-qadr or the eve of the middle of Sha‘bān in which it was revealed from the Mother Book from the seventh heaven to the heaven of this world. Indeed We have been warning We have been causing people by it to have fear of God.

Excerpt from Tafsir al-Jalalayn, commentary on 44:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.