“Thus says the Lord [yhwh], the King of Israel,
And his Redeemer, the Lord [yhwh] of hosts:
'I am the First and I am the Last;
Besides Me there is no God.
Isaiah 44:6
How many persons are speaking in Isaiah 44:6? 2 distinct persons: yhwh, the King of Israel and his Redeemer, yhwh of hosts.
Jesus is his Redeemer:
Christ has redeemed us from the curse of the law, having become a curse for us (for it is written, “Cursed is everyone who hangs on a tree”), that the blessing of Abraham might come upon the Gentiles in Christ Jesus, that we might receive the promise of the Spirit through faith.
Gal 3:13,14
Jesus is the First and the Last:
And when I saw Him, I fell at His feet as dead. But He laid His right hand on me, saying to me, “Do not be afraid; I am the First and the Last. I am He who lives, and was dead, and behold, I am alive forevermore. Amen. And I have the keys of Hades and of Death.
Rev 1:17,18
In Isaiah 44:6, the Lord and the Lord both say, ‘I am the First and I am the Last; Besides Me there is no God.’
Jesus Christ is yhwh, Jehovah.