Verš 83:7

Však pozor, vždyť věru kniha hříšníků je v Sidždžínu!

Tafsir al-Jalalayn

Nay!, verily, the record of the profligates, that is to say, the record of the deeds of the disbelievers, is in Sijjīn — this is said to be a book containing [the record of] all the deeds of the devils and the disbelievers; but it is also said to be a location in the lowermost part of the seventh earth, the place of Satan and his hosts.