Surah Al-Haqqah 69:32

ثُمَّ فِى سِلْسِلَةٍ ذَرْعُهَا سَبْعُونَ ذِرَاعًا فَٱسْلُكُوهُ

Then into a chain whose length is seventy cubits insert him."

Translation: Saheeh International

Tafsir

then in a chain whose length is seventy cubits — each cubit being that of an angel’s forearm — insert him after admitting him into the Fire the fā’ of fa’slukūhu does not prevent the verb from being semantically connected to the preceding adverbial clause.

Excerpt from Tafsir al-Jalalayn, commentary on 69:32, via Quran.com. The reader has the full commentary and 9 more tafsirs.