Surah Ar-Rahman, Verse 37

فَإِذَا ٱنشَقَّتِ ٱلسَّمَآءُ فَكَانَتۡ وَرۡدَةٗ كَٱلدِّهَانِ٣٧

fa-idhā inshaqqati l-samāu fakānat wardatan kal-dihāni

And when the heaven is split open and becomes rose-colored like oil -