The Quran Verse
Surah 13:39:
Allah eliminates what He wills or confirms, and with Him is the Mother of the Book.
This verse provides the theological justification for Abrogation (Naskh). It claims that God has a "Master Copy" (the Mother of the Book/Lawh al-Mahfuz) but can change, delete, or confirm specific verses on earth as He sees fit.
This creates a massive problem for the "immutability" of God’s word. If God is all-knowing, why would He reveal a verse only to "eliminate" it later?
Critics argue this is a convenient tool for a human author to "correct" previous statements that no longer suited his political or social circumstances.