Holy, Holy, Holy
Some would say we are reading back into the Old Testament Scriptures' teaching and doctrines like the Trinity. I would say we aren’t reading back into the Old Testament, we aren’t injecting non-existent ideas; we are reading out of the text based on the fuller revelation we have throughout the rest of Scripture.
The Bible, while having many human authors, has One divine author. And that means more than just that each writer was inspired by God to write what they wrote. It does mean that, but it means more. It means that the Bible is one narrative and not a collection of varied books, loosely connected by religious affiliation.
Therefore, when God spoke through Isaiah and Isaiah wrote what he heard and saw from the Lord, what is true of God now was true of God then. What God was revealing about Himself was never anything different from the beginning to the end. It is not that God was a non-trinitarian singularity in the Old Testament and then came up with this idea about being a Triune God around the time of the incarnation.
So, to say that the angels crying, “holy, holy, holy,” hints at the trinitarian nature of God is not a stretch at all. You only have to read a little further in the text to find the Lord saying, “who will go for US?” In my English Standard Version Bible, the “Us” is capitalized. For good reason. The “US” isn’t the Lord and the angels. It isn’t the Lord and Isaiah. It is the Father, Son, and Holy Spirit.
Holy, Holy, Holy; God in three persons; blessed Trinity!
