Verily! We have sent it (this Quran) down in the night of Al-Qadr (Decree)
97:2
2
وَمَا أَدْرَاكَ مَا لَيْلَةُ الْقَدْرِ
And what will make you know what the night of Al-Qadr (Decree) is?
97:3
3
لَيْلَةُ الْقَدْرِ خَيْرٌ مِنْ أَلْفِ شَهْرٍ
The night of Al-Qadr (Decree) is better than a thousand months (i.e. worshipping Allah in that night is better than worshipping Him a thousand months, (i.e. 83 years and 4 months).