Do not presume to say to yourselves, ‘We have Abraham as our father’: Some people had wrong assumptions. They thought that being descendants of Abraham meant they were free from God's judgment.
A key theme in Matthew is that God will create new children of Abraham. He will include non-Jews (Gentiles) in God's people. He will remove Jews who reject the Messiah (see 8:11–12; 21:43; 22:1–14; 28:16–20; Romans 4:9–25; Galatians 3:6–14, 29).