Severian of Gabala in his Sermons on Genesis says,
The two Testaments are brothers: they issue from the same father, and that is why they express themselves in similar terms. They have almost exactly the same appearance, the same traits. Just as there many points of similarity between two brothers, whom the same father brought into the world, there is the same close relationship between the two Testaments, whose origin is the same. In the Old Testament, the law appeared first, followed by the prophets ; in the New Grace, the Gospel is first and the apostles follow. Here we find twelve prophets, namely Hosea and others: then the four famous ones, Isaiah, Jeremiah, Ezekiel, Daniel. In turn the New Testament gives us twelve apostles and four evangelists. It is by brothers that the voice of God in the Old Testament is made known; because Moses and Aaron were the first ones charged to set forth the will of the Lord: similarly, in the Gospel, the first that were called were Peter and Andrew. There was only a regular grace, here a grace two times more precious. There the were two brothers were called Aaron and Moses ; here there are two brothers twice, Peter and Andrew, and James and John. It was the intention of Christ to offer us an image of love in the Holy Spirit, and to make us brothers at the same time by feeling and spirit: in consequence he takes nature as a foundation; he joins to it the tender feelings of humanity, and with that he built the foundations of his Church. In the Old Testament, the first miracle that appears is the changing of the waters from a river into blood ; the first miracle that we see in the New is the changing of water into wine.
I love the bit about Moses, Aaron, Peter, Andrew, James and John. A doubling of the Old Covenant pattern.