We revealed it in the Night of Destiny.*
إِنّا أَنزَلنٰهُ فى لَيلَةِ القَدرِ
innaa anzalnaahu fee lailatil qadr
*97:1 The Quran was placed into Muhammad’s soul on the 27th night of Ramadan, 13 B.H. (Before Hijrah). See also 17:1, 44:3, 53:1-18, and Appendix 28.