Surah Al-Haqqah, ayah 32

ثُمَّ فِي سِلۡسِلَةٖ ذَرۡعُهَا سَبۡعُونَ ذِرَاعٗا فَٱسۡلُكُوهُ ٣٢

Thumma fī silsilatin dhar'uhā sab'ūna dhirā'an faslukūh

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