سورة Al-Isra ( The Night Journey ) - الآية 79

And in some parts of the night (also) offer the Salat (prayer) with it (i.e. recite the Quran in the prayer), as an additional prayer (Tahajjud optional prayer Nawafil) for you (O Muhammad SAW). It may be that your Lord will raise you to Maqaman Mahmuda (a station of praise and glory, i.e. the highest degree in Paradise!).