The Holy Quran 73:18 — Surah Al-Muzzammil

Arabic text

ٱلسَّمَآءُ مُنفَطِرٌۢ بِهِۦ ۚ كَانَ وَعْدُهُۥ مَفْعُولًا

The sky will be split apart on that day. His (Allaah's) promise always takes place. (is final).

that is, the promise of Allah is unalterable and will certainly come to pass, however improbable you may consider it.

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