وَإِنَّ الْقُرْآنَ كَلَامُ اللَّهِ
The Qur’an is the speech of Allah.
Clause structure: In wa inna al-Qurʾāna kalām Allāh, inna gives emphasis while the construct phrase kalām Allāh attributes speech to Allah. This is the predicate.
Meaning and inference: The speech is attributed to Allah; the Qur’an is not therefore simply a composition authored by a human being.
Limit of inference: The construct phrase alone does not settle every lexical, recitational, or phonetic question; other issues need their own evidence.