Surah 23

Surah 23:62

"We do not burden anyone beyond his capacity, and with Us is a Book (which) speaks in truth – and they will not be done evil."

– with Us is a Book (which) speaks in truth
The “Book” (kitāb) in this verse does not refer to a scripture, but rather to a just accounting of people’s deeds with Allah.

- from The Quran with Christian Commentary: A Guide to Understanding the Scripture of Islam