Surah Ash-Shu'ara 26:187

فَأَسْقِطْ عَلَيْنَا كِسَفًا مِّنَ ٱلسَّمَآءِ إِن كُنتَ مِنَ ٱلصَّـٰدِقِينَ

So cause to fall upon us fragments of the sky, if you should be of the truthful."

Translation: Saheeh International

Tafsir

Then make fragments read kisfan or kisafan of the heaven fall upon us if you are of the truthful’ in your Mission.

Excerpt from Tafsir al-Jalalayn, commentary on 26:187, via Quran.com. The reader has the full commentary and 9 more tafsirs.