Surah Al-Muzzammil — Ayah 4

قُمِ ٱلَّيْلَ إِلَّا قَلِيلًا

Arise [to pray] the night, except for a little -

نِّصْفَهُۥٓ أَوِ ٱنقُصْ مِنْهُ قَلِيلًا

Half of it - or subtract from it a little

إِنَّا سَنُلْقِى عَلَيْكَ قَوْلًا ثَقِيلًا

Indeed, We will cast upon you a heavy word.

إِنَّ نَاشِئَةَ ٱلَّيْلِ هِىَ أَشَدُّ وَطْـًٔا وَأَقْوَمُ قِيلًا

Indeed, the hours of the night are more effective for concurrence [of heart and tongue] and more suitable for words.