Jewish scholars like Benjamin Sommer, Alex Segall, Daniel Boyarin have already stated that early Judaism recognised and understood there was some kind of plurality within YHWH. It is only when the rabbis sought to clearly distinguish Judaism from Christianity they started declaring this belief a heresy and defining YHWH as an absolute Monad.

Benjamin Sommer in his book bodies of God explicitly says the Christian trinity is perfectly consistent with the Hebrew Scriptures (OT).