Matthew 15:22

Matthew introduced this extraordinary story with an extraordinary word, "Behold," which the NIV version omits. By describing this woman as a Canaanite the writer drew attention to the fact that she was a descendant of Israel’s ancient enemies. She came out from that region in the sense that she left her home to meet Jesus. Her use of "Lord" may have been only respectful. [Note: See my note on 8:2.] However by calling Him the Son of David she clearly expressed belief that He was Israel’s promised Messiah who would heal His people (cf. Matthew 9:27; Matthew 12:23).

"She plainly reveals that she has knowledge of the Messianic hopes of Israel and had heard that they were being connected with Jesus as the promised great descendant of King David." [Note: Lenski, p. 594.]