Robert Jenson points out the need to read the Bible as narrative to see the persons of the Trinity as dramatis personae in the Old Testament:
The church has its own way of reading Scripture. There are others. By way of putting the contrast let me say a word or two about the other most important way - Rabbinic Judaism...
Rabbinic Judaism reads the Old Testament fundamentally as Torah - guidance for life. The narrative simply provides the context. Now, this is obviously a perfectly possible way of reading the Old Testament, but it is not the Church's.... The Church's second volume, the New Testament, is fundamentally narrative, with comment on the narrative. The Church then reads the Old Testament from this viewpoint. From the viewpoint of this new volume and accordingly reads the Old Testament basically as narrative, with Torah and Wisdom and Prophecy providing the moral and spiritual context...
The narrative is of God's history with his people from creation to fulfilment...it is an obvious question, but one too often not asked, 'how would a narrative display the reality of God?'
How for example would a narrative show that God is merciful? Not primarily by pronouncing the proposition 'God is merciful', though it can do that too. Rather, by telling and pondering his merciful behaviour. Or by recording prayers uttered by his people on the way, prayers for mercy that are answered. Or by telling stories of heroes of Israel who found mercy with God...
So how would a narrative tell us that God is one God and three persons? It would not do it primarily, or perhaps even at all, by saying 'God is three persons' a proposition that indeed never appears in Scripture, but rather by telling a history of God with us which displays three actors, or as David Scaer put it 'three performers', of that history. Each of which is indeed other than the other two, and yet is at the same time the same God as the other two.
(10:00-14:50, MP3 lecture, Confessions - The Bible and the Trinity)
Richard Bauckham stresses that we should consider the concept of "divine identity" when reading the New Testament to find out the true identity, and not the nature, of Jesus Christ:
The God of Israel had a unique identity...the biblical God has a name and a character, since this God acts, speaks, relates, can be addressed and, in some sense, known...
personal identity [is] a concern with who God is. The value of the concept of divine identity appears partly if we contrast it with a concept of divine essence or nature. Identity concerns who God is; nature concerns what God is or what divinity is...That God is eternal, for example - a claim essential to all Jewish thinking about God - is not so much a statement about what divine nature is, more an element in the unique divine identity, along with claims that God alone created all things and rules all things, that God is gracious and merciful and just, that God brought Israel out of Egypt and made Israel his own people and gave Israel his law at Sinai and so on. If we wish to know in what Second Temple Judaism considered the uniqueness of the one God to consist, what distinguished God as unique from all other reality, including beings worshipped as gods by Gentiles, we must not look for a definition of divine nature but for ways of characterizing the unique divine identity...
Once the category of divine identity replaces those of function and nature as the primary and comprehensive category for understanding both Jewish monotheism and early Christology, we can see that the New Testament's lack of concern with the divine nature of Christ is by no means an indication of a merely functional Christology. We can see that, throughout the New Testament texts, there is a clear and deliberate use of the characteristics of the unique divine identity to include Jesus in that identity. Once we have rid ourselves of the prejudice that high Christology must speak of Christ's divine nature, we can see the obvious fact that the Christology of divine identity common to the whole New Testament is the highest Christology of all. It identifies Jesus as intrinsic to who God is.
(pp.6-31, Richard Bauckham, "God Crucified" in Jesus and the God of Israel)