There was a time, long ago when this name, Yahweh, was so holy that was unspeakable. Even in some ancient writings, they would substitute writing it with four horizontal dots to keep it's honor sacred.
Here, God speaks His name to Moses. Here, God gives Moses permission to speak His name to others. Tell them I AM. Tell them Yahweh is My name forever.
How beautiful that we know these names of our God. An eternal name that means He is present with us at all times. Spoken and given by God Himself as an introduction of how He wants to be honored throughout every generation.
Proof that the Old Testament is not out dated. For if every generation is to use this name, that includes us. How else would we know this unless we read it. Let us never neglect these writings... living and active and sharper than any double-eged sword.
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