Authentic Supplication Number 47.

“O thou folded In garments! Stand [to prayer] by night less some of it. Half of it, or a little less, or a little more; And recite the Qur’an in slow, measured rhythmic tones. Soon we shall launch down unto thee a heavy Statement. Truly the rising by night is a time when impression is more keen and speech more upright” (68).

“And as for the night keep awake a part of it as an additional prayer for thee: may thy Lord raise thee to a Praised station” (69).

“And part of the night, prostrate thyself to Him; And glorify Him a long night through” (70).

It is reported of the Prophet  that he said: “Our Lord descends to the lowest sky [of the seven] when the last third of the night remains, then he says: Who is calling upon Me such that I may answer him, who is asking Me such that I may grant him, who is requesting My forgiveness such that I may forgive him (71)”.

Footnotes.
(68) Surat Al-Muzammil (#73) Vs. 1-6.
(69) Surat Al-lsra’ (#17) V. 79.
(70) Surat Al-lnsan (#76) V.26.
(71) See a book called “Sharh Hadeeth Annuzool” which means “The Explanation of the Hadeeth of Down-Coming” by Shaikh Al-lslam Ibn Taymiya, for he has excelled in clarification of that which the Muslim is required to believe with respect to the descent of The Divine.

Reporters.
This hadeeth is reported in both Saheeh ‘Al-Bukhari and Saheeh Muslim. Al-Albani included it in The Authentic of Good Sayings as #41.