Surah Al-Waqi'ah 56:6
فَكَانَتْ هَبَآءً مُّنۢبَثًّا
And become dust dispersing,
Translation: Saheeh International
Tafsir
so that they become a scattered dust the second idh ‘when’ is a substitution for the first idh
Excerpt from Tafsir al-Jalalayn, commentary on 56:6, via Quran.com. The reader has the full commentary and 9 more tafsirs.