وَاللَّيْلِ إِذَا يَغْشَاهَا (and by the night when it envelops him,...91:4). In other words, when it [ the night ] sets in, the brightness of the sun is concealed [ and only darkness prevails ].
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He has revealed to you ˹O Prophet˺ the Book in truth, confirming what came before it, as He revealed the Torah and the Gospel