Every word of God is flawless; He is a shield to those who take refuge in Him. Do not add to His words, or He will rebuke you and prove you are a liar. Proverbs 30:5-6.
Heaven and earth will pass away, but My words will never pass away. Matthew 24:35.
Your word, O Lord, is eternal; it stands firm in the heavens. Your faithfulness continues through all generations; You established the earth, and it endures. Your laws endure to this day, for all things serve You. Psalm 119: 89-91.