وَاللَّيْلِ إِذَا يَغْشَاهَا (4)
(91:4) and by the night as it envelopes the sun; *2
*2) That is, when the night comes, the sun hides and its light remains hidden throughout the night. This state has been described, saying that the night covers up the sun, for the night actually signifies the sun's hiding behind the horizon because of which its light cannot reach that part of the earth where the night has fallen.