This one is a two-fer:

Jeremiah 31:15

This is what the LORD says:
“A voice is heard in Ramah,
mourning and great weeping,
Rachel weeping for her children
and refusing to be comforted,
because her children are no more.”

Matthew 2:17 points to Herod’s slaughter of all male children, two years old and under, in Bethlehem and its vicinity as the fulfillment of this prophecy.

Psalm 78:1-2

O my people, hear my teaching;
listen to the words of my mouth.
I will open my mouth in parables,
I will utter hidden things, things from of old–

Again, Matthew sees the fulfillment of this prophesy in Jesus Christ:

Matthew 13-34-35:

Jesus spoke all these things to the crowd in parables;
he did not say anything to them without using a parable.
So was fulfilled what was spoken through the prophet:
“I will open my mouth in parables,
I will utter things hidden since the creation of the world.”

The gospel of Matthew was written for a largely Jewish audience. So, Matthew, inspired by the Holy Spirit, took great pains to tie the prophecies of the Old Testament to Jesus Christ. For the Jews reading or (more likely) hearing Matthew’s Gospel for the first time, these connections would have deep resonance. Indeed, they would be great hammer blows shattering their unbelief.

St. Augustine declared that “The New Testament was in the Old concealed; the Old is in the New revealed.” Matthew’s gospel continues to reveal that to us today.