Jesus said, "For truly I tell you, until the sky and earth pass away and perish, not one smallest letter nor one little hook [identifying certain Hebrew letters] will pass from the Law until all things [it foreshadows] are accomplished." - Matthew 5:18
The Psalmist said, "Forever, O Lord, Your word is settled in heaven [stands firm as the heavens]. -Psalm 119:89
Paul wrote to Timothy: "Every Scripture is God-breathed (given by His inspiration) and profitable for instruction, for reproof and conviction of sin, for correction of error and discipline in obedience, [and] for training in righteousness (in holy living, in conformity to God's will in thought, purpose, and action), So that the man of God may be complete and proficient, well fitted and thoroughly equipped for every good work."