"indeed, it [i.e., the Quran] is a word [conveyed by] a noble messenger..."

[That] indeed, it [i.e., the Quran] is a word [conveyed by] a noble messenger [i.e., Gabriel]
[Who is] possessed of power and with the Owner of the Throne, secure [in position], Obeyed there [in the heavens] and trustworthy.