The words of Scripture are indeed the words of God as given to the apostles by the Holy Spirit.
Psalm 119:89 Your word, LORD, is eternal; it stands firm in the heavens.
לְעוֹלָם יְהוָה-- דְּבָרְךָ, נִצָּב בַּשָּׁמָיִם.
Forever, LORD, your word stands in heaven.
בַּשָּׁמָיִם (lə·‘ō·lām) means "forever", not "eternal." It will last from the time uttered forever.