ٱلْمَعَارِج : ٨

  • يَوۡمَ (The) Day
  • تَكُونُ will be
  • ٱلسَّمَآءُ the sky
  • كَٱلۡمُهۡلِ like molten copper
On the Day the sky will be like murky oil,1
Footnotes
1 Or "molten metal."
The day when the sky will be (yawma takoonu'l-samaa'u is semantically connected to an omitted clause, implicitly taken to be yaqa'u, 'it will take place') as molten silver,