سُبْحَانَ ٱللَّٰهِ
Holy Qur'an
Al-Qur'an
Kids Qur'an
This is based on the commentary of Ibn Kathîr.
If we take Sijjin to be the Register itself, and not the place where it is kept, the Register itself is a sort of Prison for those who do wrong. It is inscribed fully: i.e., no one is omitted who ought to be there, and for every entry there is a complete record, so that there is no escape for the sinner.