Surah Al-Qadr 97:3

لَيْلَةُ ٱلْقَدْرِ خَيْرٌ مِّنْ أَلْفِ شَهْرٍ

The Night of Decree is better than a thousand months.

Translation: Saheeh International

Tafsir

The Night of Ordainment is better than a thousand months in which there is no Night of Ordainment for a righteous deed on that Night is better than one performed for a thousand months without it.

Excerpt from Tafsir al-Jalalayn, commentary on 97:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.