The first and the last, to what?
The first to die and rise. and the last to enter into Hades.
Do not be afraid: I am the first and the last. I am he who lives, and was dead, and behold, I am alive forever and ever. And I hold the keys to Hades and death.
- 'Don't be afraid anymore, I am the first to rise and the last to die. Look at the proof, I was dead and I live, and I will always live. I hold power over death itself'.
Whatever way you spin it, this verse is about death and life. About the fact that Jesus died with sin and rose clean. And will never die again. And holds all power over death.
It is the fulfilment of the prophecy of old that 'Death and hades will be defeated'.
And what did that prophecy originally say?
The Spirit of the LORD will rest on him-- the Spirit of wisdom and of understanding, the Spirit of counsel and of power, the Spirit of knowledge and of the fear of the LORD--
So the spirit of the Lord is as I have said. Wisdom, understaning. Love, faith, hope. That spirit resided in Jesus.
The days are coming," declares the LORD, "when I will raise up to David a righteous Branch, a King who will reign wisely and do what is just and right in the land. 6 In his days Judah will be saved and Israel will live in safety. This is the name by which he will be called: The LORD Our Righteousness. - Aka Jesus.
I will raise up for them a prophet like you from among their brothers; I will put my words in his mouth, and he will tell them everything I command him
Though all these verses refer to God's raising up of this prophet. But never to God's 'becoming' of the prophet.
It does not sit with God's state that He should become a man. But certainly can BEGET a saviour:
So Christ also did not take upon himself the glory of becoming a high priest. But God said to him, "You are my Son; today I have become your Father." 6 And he says in another place, "You are a priest forever, in the order of Melchizedek."