> O.K. Given that the word 'trinity' as such is a tool of new testamentarian theology to explain what seems evident from various readings already mentioned. However, if you examine Isaiah closely, you will see clear portraits of the Messiah and His coming to us as man/divinity.
I fully accept that the Old testament contains numerous references to the coming of a Messiah, and that the various prophets of the Old testament foretold this. But what I can't find is any reference to the Divine nature of the Messiah, which would constitute the bedrock of the Doctrine of the Trinity.
If you can find any references to the Divine nature of the Messiah I would be very grateful.