The Holy Quran. Chapter 97. Al-Qadr. The Night of Power.
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I seek refuge in Allah from the rejected Satan.
In the name of Allah, the Most Merciful, the Most Compassionate.
Behold, We revealed this (Qur'an) on the Night of Power. And what do you know what the Night of Power is? The Night of Power is better than a thousand months. The angels along with the Spirit descend in it by the permission of their Lord with all kinds of decrees. All peace is that night until the rise of dawn.
Reference: Translation based on Tafheemul Quran.