...but in the OT there was no concept of Jesus as he had not yet been born. Was it the "Word" that became flesh such that the OT concept was Father, Word, and Holy Spirit (no I am not being facetious)? What OT verses would support this idea or an even better explanation of OT Trinity? Since I don't believe that God changes or evolves over time, there should be a continuity between OT and NT concepts of God even if there is a different covenant or relationship with man over time as we do grow collectively.
Edit: Perhaps the Christian understanding is that, although God does not change, He manifests or reveals of Himself differently to different peoples and times.
That last part is called modalism, it is something that creeps into every discussion about the Trinity, but was declared to be a heresy from its inception. Nonetheless, I wouldn't be surprised to find out that the vast majority of Christians are actually modalists without realizing it.
With Skye Ephémérine I would agree that Jews are perhaps best to explain any plan of salvation to be based on the OT alone. And my guess is that their answer both to that question and to any expression of the Trinity in the OT would be very different from that of a Christian. That doesn't preclude Christians from looking back and seeing what I call "hints" of the Trinity in the Tanakh. Just as some Muslims tend to see Muhammed in passages of the Bible, so Christians tend to see a triune God in the Tanakh. And just as I think that Muslims are reading things into the Bible that are not there when they make those great leaps, no doubt Jewish readers of the Tanakh would say the same to me.
But for me, to worship Jesus is no different than worshipping the God of the Old Testament. I can't give them all here, but let me cite one example:
Paul, the writer of Philippians, is saying about Jesus what Isaiah 45:23 ("But in the LORD all the descendants of Israel will be found righteous and will exult.") says about the LORD. Now Isaiah is an OT passage and so clearly isn't talking about Jesus, but Paul then concludes that Jesus is LORD, that is, the same LORD God of the Old Testament.
Of course, this doesn't prove anything. It could be that it is merely Paul who is showing his views, and perhaps he is in error in drawing the conclusion that he does. Accept, that he isn't alone in doing so. We see Peter doing the very same thing in Acts 2, while Paul is still breathing out threats against Christians for this very act of equating Jesus with God.
But more than this, I would like to submit to everyone reading this thread that even the Jewish understanding of monotheism is NOT what many have been led to believe. Now some like to turn to Genesis 1:26 ("Let
us make man in
our image.") and point to the plural pronouns. For myself, I am quite willing to concede to scholarship that suggests this is nothing more than the royal "we" and give that passage little weight in my argument. However, I do think a little more weight needs to be given to the "angel of Yahweh" who appears to Abraham in Genesis 18 as perhaps a pre-incarnation appearance of the second person of the Trinity.
But, please, don't construe my statements as saying that there is a specific formulation of the Trinity present in the OT. I'm not saying that. What I am saying is that things like the use of the plural term
Elohim to speak about God along with the personification of
ruach (God's Spirit) and
dabar (God's Word) in various OT narratives simply point to both the concepts of plurality and relationality as being foundational in even the Hebrew understanding of the one God.*
Even before the birth of Jesus and the writings of the NT, there is an incipient pluraity in the one God expressed in terms of "Wisdom," "Word," and "Spirit," which serve as (semi-)personified agents of divine activity. In other words, even in monothesitic Judaism, the existence of personified agents, pointing to the idea of plurality in the one God, was NOT seen as a threat to monotheism.**
Some examples: Word, beginning from the first creation account (Genesis 1:1-2:4a) appears as the agent of God; it was through the Word (and Spirit) that creation was accomplished (Psalms 33:8-9), and the Word is able to accomplish its God-given purposes (Isaiah 55:10-11). Spirit, sometimes coupled with either Word or Wisdom brings about and sustains life (Genesis 1:2), sustaining all life (Genesis 1:2; Psalm 104:29-30).
In addition to these semi-personified agents of the one God, the Jewish Tanakh knows others, such as the name of Yahweh, especially in Deuteronomic theology. Note that the "name of Yahweh" dwells in the temple (Deuteronomy 12:5, 11, etc.)
while, at the same time God is in heaven. (Deuteronomy 26:15). Still one more example is the "glory of God" that acts as an agent separately from, yet sent by, Yahweh -- the book of Ezekiel (especially 43:4-7) is a collection of prime examples.
Theologian Richard Bauckham (
God Crucified: Monotheism and Christology in the New Testament) maintains that the early Jewish definition of God could include the person of the Son WITHOUT a violation of traditional monotheism. The key is to understand that even the highest angels or heavenly powers, while participating alongside God and sharing in God's rule over the earth, did NOT share in God's
essence. God was not just at the top of a hierarchy of beings, God was/is a totally unique being, completely uncomparable in nature to any other. However,
ruach and
dabar do share God's essence, for they are a part of God. Thus, distinctions within the one God , such as between God's Word and God's Spirit, were not understood as compromising God's inherent unity. Therefore, Bauckham concludes: "The Second Temple Jewish understanding [that in operation in the first century] of the divine uniqueness...does NOT make distinctions within the divine identity inconceivable."
Sad to say, but I fear that many, on seeing this the length of this post, will either completely skip over it, or begin to critique it point by point from the top. If they do so, they will completely miss reading it in the context of what I am about to say next:
None of the above implies that there must be a Trinity. It just means that when early Christians (all Jews) began to try to make sense out of their experience in which they on the one hand had the Shema (Deuteronomy 6:4 -- "Hear, O Israel: 'The LORD our God, the LORD is one'.") and on the other hand were experiencing God's presence in their lives through the Spirit at Pentecost, that they already had a framework within monotheistic Judaism in which they could conceive of this. As Wolfhart Pannenberg said, "Christian statements about the Son and Spirit take up questions which had already occupied Jewish thought concerning the essential transcendent reality of the one God and the modes of his manifestation" (Pannenberg,
Systematic Theology).
The vivid personfications of Wisdom/Word and Spirit already present in the Tanakh, inasmuch as they were not only identified with God and God's divine activity but also (and paradoxically) at the same time distinguished from God, served to open up the way for 1st century Jews who were finding salvation to be anchored in God's Messiah and who were experiencing God's Spirit as interacting with them in their personal lives to recognize God as being tripersonal. I don't think they would have made that leap, for it is a big one, if these divine personifications and Father/Son language was not already present for them in their existing Bible.
No doubt today, Jews who have not had the same experience that these early Christ-following Jews had, would look at the same texts differently. But with
both these things --the foreshadowings in scripture and their own experience-- it is possible for a Christian today to look back and see what was missed by those who lived the OT, that is the one and only God is indeed a multi-personal being who has always existed in inter-personal relationship within himself.
In many respects, in the older testament regarding God's covenantal relationship with humanity, many things are seen from Israel's attempt to project the Father's point of view; wheras, what we have in the newer testament is the church's attempt to project a portrayal of the Father from the Son's point of view.
*For a further discussion of this idea, see Ben Withington and Laura Ice,
The Shadow of the Almighty: Father, Son, and Spirit in Biblical Perspective; Robert Letham, The Holy Trinity In Scripture, History, Theology, and Worship; and Herman Bavinck, In the Beginning: Foundations of Creation Theology.
**For more detailed discussion of this, see Gerald O'Collins, Tripersonal God.