Surah Adh-Dhariyat, ayah 17

51:17

كَانُواْ قَلِيلٗا مِّنَ ٱلَّيۡلِ مَا يَهۡجَعُونَ ١٧

Kānū qalīlam minal-layli mā yahja'ūn

They used to sleep but little of the night,1538

Footnotes

1538 i.e., spending a portion of the night in prayer and supplication.