55:37
فَإِذَا ٱنشَقَّتِ ٱلسَّمَآءُ فَكَانَتْ وَرْدَةً كَٱلدِّهَانِ
fa-idhā inshaqqati l-samāu fakānat wardatan kal-dihāni
When the sky is torn apart and turns crimson, like red hide.
Then when the heaven is rent asunder, and it becomes rosy or red like red-oil, or red hide - [See V.70:8]