the gospel of Mathew depicts a King who would come to unify the old and the New. Considering that the promised King would come from the lineage of David

this thus connects to Abraham call that was foretold in the Old Testament. Linking g both Abraham’s call and Nathan’s Oracle lays the foundation to the events that would shape the New Testament in terms of the coming of a new king. The promise given to Abraham about the coming of a new Kind through his decedents is thus revealed through David. Nathan who by this time is just a normal person is used to bring the news of a covenant that God would make to usher in a new age of faith