The sum of your word is truth

The sum of your word is truth, and every one of your righteous rules endures forever. Psalm 119:160

Every word of promise God made from the beginning of the world, and in any period of time, to any other person or persons was true in itself, and faithfully performed, not one ever failed: particularly the promise concerning the Messiah.

All that is contained in the word of God is truth, its promises, precepts and doctrines, histories, prophecies and proverbs, all the sayings of it are faithful and true.The decrees of the LORD are firm

And more than that, they are valid forever.

… you established them to last forever Psalm 119:152
… the word of our God stands forever Isaiah 40:8