O thou wrapped up in thy raiment! (1) Keep vigil the night long, save a little - (2) A half thereof, or abate a little thereof (3) Or add (a little) thereto - and chant the Qur'an in measure, (4) For we shall charge thee with a word of weight. (5) Lo! the vigil of the night is (a time) when impression is more keen and speech more certain. (6) (Holy Qrura'n : Surah Al-Muzzammil)