For readers of Greek or anyone learning Biblical Greek, please feel free to translate and/or comment.
Matthew 5:17 (LDGNT)
17Μὴ νομίσητε ὅτι ἦλθον καταλῦσαι τὸν νόμον ἢ τοὺς προφήτας οὐκ ἦλθον καταλῦσαι ἀλλὰ πληρῶσαι
Comment from the Faithlife Study Bible:
5:17 to fulfill The Greek word used here, plēroō, refers in this instance to carrying something out. Matthew is saying that Jesus performed or upheld that which was required by the law and met the expectations of the predictions about Him in the writings of the prophets. In Him, the Law and the Prophets reached their fullest expression (e.g., 1:22; 2:15, 17, 23).
Barry, J. D., Mangum, D., Brown, D. R., Heiser, M. S., Custis, M., Ritzema, E., … Bomar, D. (2012, 2016). Faithlife Study Bible (Mt 5:17). Bellingham, WA: Lexham Press.