Albert Barnes on Matthew 12:17

That it might be fulfilled, etc. Matthew here quotes a passage from Isa 43:1-4, to show the reason why he thus retired from his enemies, and sought concealment. The Jews, and the disciples also, at first, expected that the Messiah would be a conqueror, and vindicate himself from all his enemies. When they saw him retiring before them, and instead of subduing them by force, seeking a place of concealment, it was contrary to all their previous notions of the Messiah. Matthew, by this quotation, shows that their conceptions of him had been wrong. Instead of a warrior and an earthly conqueror, he was predicted under a totally different character. Instead of shouting for battle, lifting up his voice in the streets, oppressing the feeble-- breaking bruised reeds, and quenching smoking flax, as a conqueror--he would be peaceful, retiring, and strengthening the feeble, and cherishing the faintest desires of holiness. This appears to be the general meaning of this quotation here. Comp. Isa 42:1 and following.

(v) "saying" Isa 42:1