Surah Al-Humazah 104:9
فِى عَمَدٍ مُّمَدَّدَةٍۭ
In extended columns.
Translation: Saheeh International
Tafsir
in outstretched mumaddadatin is an adjective qualifying the preceding noun ‘amadin columns read ‘umudin or ‘amadin and will therefore be inside the columns.
Excerpt from Tafsir al-Jalalayn, commentary on 104:9, via Quran.com. The reader has the full commentary and 9 more tafsirs.