"17 Do not presume that I came to abolish the Law or the Prophets; I did not come to abolish, but to fulfill. 18 For truly I say to you, until heaven and earth pass away, not [a]the smallest letter or stroke of a letter shall pass from the Law, until all is accomplished! 19 Therefore, whoever nullifies one of the least of these commandments, and teaches [b]others to do the same, shall be called least in the kingdom of heaven; but whoever [c]keeps and teaches them, he shall be called great in the kingdom of heaven." (Matthew 5:17-19)

“It is easier for Heaven and Earth to pass away than for the smallest part of the letter of the law to become invalid.” (Luke 16:17 NAB)

“All scripture is inspired by God and is useful for teaching, for refutation, for correction, and for training in righteousness…” (2 Timothy 3:16 NAB)

Seems pretty definitive to me..quest is, why doesn't it seem definitive to you?