91:4
وَٱلَّيْلِ إِذَا يَغْشَىٰهَا ٤
Saheeh International
And [by] the night when it covers it
Tafsir of "Ibn Kathir" (English)
By the night as it Yaghshaha.meaning, when it covers the sun, which takes place when sun disappears and the horizons become dark.Concerning Allah's statement,وَالسَّمَأءِ وَمَا بَنَـهَا