Jehovah
Jehovah — the covenant name, rendered LORD; the premortal Jesus Christ
At the same time spake the LORD by Isaiah the son of Amoz, saying, Go and loose the sackcloth from off thy loins, and put off thy shoe from thy foot. And he did so, walking naked and barefoot. Isaiah 20:2–3
Jehovah, the premortal Christ, speaks through His servant Isaiah and makes the prophet's own life a living sign.
AttestedJehovah — the LORDA divine name
How we know: Jehovah is the premortal Christ (Abraham 1:16; D&C 110:3–4)