New Defender's Study Bible Notes
5:17 not come to destroy. The Lord Jesus, by His own word, did not destroy the law of God; thus it is still operable. He did, however, alone of all men, obey it perfectly. He fulfilled all its demands and requirements, which no other man or woman could ever do. Consequently, He alone can redeem us from “the curse of the law” (Galatians 3:13).
5:18 one jot or one tittle. The “jot” and “tittle” were the smallest letter and a mark which distinguished two letters in the Hebrew words of the Old Testament. Thus, not only the words, but even the letters are divinely inspired, in the original autographs of the Scriptures.