The real meaning of fulfillment can at first be hard to identify on surface level when one reads through the Scripture. When we read Matthew’s citation of Hosea in which he describes that “Out of Egypt I have called my son” I think fulfillment is conveyed in the form of this son: Jesus. Like described in ‘Scribes of the Kingdom‘, these words from Hosea announce the arrival of Jesus as the beginning of a new exodus; essentially, Jesus will lead Israel to fulfillment. This fulfillment is also displayed in his name when the angel appears to Joseph to tell him that “the virgin will conceive and give birth to a son, and they will call him Immanuel”(Mat 1:23), Immanuel meaning “God with us”.
Given that the Old Testament was written before the New Testament, it makes sense that one is able to find links and allusions between them. One of the first connections I found was also underlined in the reading ‘The Genealogy of Matthew‘. Genesis 12 describes the first elements that are given to Abraham- land, descendants and blessing- and ‘as seen already in Abraham, the vocation of Israel is universal in scope, and in Jesus it finds its realization‘. Another similarity between the Old testament and the New testament are the dreams. In Genesis 37, Joseph dreams about how he will rule over his siblings, and even though the dream described from Jesus’ father Joseph on Matthew 1 has is not about him ruling over his siblings, he does dream about the child Mary is carrying. The similarity in here relies on the fact that both dreams are a way through which they are receiving messages from and through which they are looking into the future; in both cases, divine revelation is displayed through a dream.