Concise Quran Commentary
When the sky will split open for the angels to descend from it and it will be red like molten lead or the like due to the terror of the day of judgment.
Tafsir for this Ayah
Surah 55 : Ayah 37
Surah 55 : Ayah 37
فَإِذَا ٱنشَقَّتِ ٱلسَّمَآءُ فَكَانَتْ وَرْدَةً كَٱلدِّهَانِ
When the heaven is split asunder and becomes crimson like [burnt] oil[10].