Chiasmus in direct quotations of Isaiah in the gospel of Matthew. Note that A and A’ only refers to “a prophet’ or ‘it is written’ and does not explicitly name Isaiah in the Matthew quote.
A. Beginning of the house / birth of Jesus (Matt 1:22-23; Isa 7:14)
B. The need for change (Matt 3:3; Isa 40:3)
C. Darkness and the need for light (Matt 4:14-16; Isa 9:1)
D. The suffering servant (Matt 8:17; Isa 53:4)
D’. Behold my servant (Matt 12:17-21; Isa 42:1-4)
C’. Dullness and the need for healing (Matt 13:15-15; Isa 6:9-11)
B’. The need for change (Matt 15:7-9; Isa 29:13)
A’. A house of prayer (Matt 21:13; Isa 56:7)
I think that these quotes were included to show his Jewish readers that Israel had turned their backs on God’s house and so needed to change. This would happen through a light shining to the whole world, including the gentiles, in the form of God’s beloved suffering servant.