Surah 43:4
"And surely it is in the mother of the Book, with Us, most high indeed, wise."
43.4 – And surely it is in the mother of the Book, with Us
The “mother of the Book” (umm al-kitāb) is a mysterious expression that may refer to a concept of a source of all the heavenly books (also 3.7; 13.39). See the discussion of the Quran’s “doctrine of scripture” at 85.21–22.
- from The Quran with Christian Commentary: A Guide to Understanding the Scripture of Islam