Jehovah
Go and tell Hananiah, saying, Thus saith the LORD; Thou hast broken the yokes of wood; but thou shalt make for them yokes of iron. Jeremiah 28:13–16
The LORD of hosts, the God of Israel, the premortal Christ, speaks through His true prophet and exposes a prophet who spoke in His name without being sent.
AttestedJehovah — the LORDHe speaks in the first persona messenger speaking for Him
How we know: the verse itself names Him