Every faithful Bible reader must surely know that in Exod.3:1-15 Moses recorded his encounter with the Person in the bush which was burned with fire but not consumed [Exod.3:2]. In that encounter, the Person told Moses to acknowledge the Israelites that ‘YHWH’ has sent Moses to bring the Israelites out of Egypt. ‘YHWH’, wrote Moses, without syllables, hence can not be pronounced.
Since that time on, ‘YHWH’ was considered the name of the Most High by the Israelites. To the present times, they lift high and sanctify the name ‘YHWH’ (which is unpronounceable), and in order to worship that Person in prayers, that they chose and applied other (pronounceable) names to their Deity, such as Adonai, Yahweh, Jehovah, etc. with whatever reasons in their minds.
Now a critical question arises: Is it lawful to call and worship the Israelite’s Deity with ‘Yahweh’ or ‘Jehovah’ names in place of the unpronounceable name ‘YHWH’? This question must be answered from the point of view of Moses, since Moses was the only man who encountered the Person and (probably) heard Him pronounced ‘YHWH”!
Lawful or not, Jesus who came down from heaven from the bosom of His Father [John 1:18] knew better. Jesus warned the Israelites in John 5:45 that “…there is one that accuseth you, even Moses, in whom ye trust.” Moses will be your accuser, you, who pronounce the unpronounceable name.
If we are to be the faithful followers of Moses, then we have to worship ‘YHWH’ (in an unpronounceable way), and we are not to worship Yahweh or Jehovah, which was not taught by Moses! Whosoever call and worship ‘Jehovah’ or ‘Yahweh’ (etc.) which are not acknowledged by Moses, he will consider them to have been drifted away from Moses’ teaching! Moses will accuse you: “Heresy!”
Lift Up The Name of Yhwh (PDF)