Rev 22:13
I am Alpha and Omega, the beginning and the end, the first and the last.
Behold, I am coming quickly, and My reward is with Me, to reward each one as his work deserves. I am the Alpha and the Omega,
the first and the last, the beginning and the end.”
Blessed are those who wash their robes, so that they will have the right to the tree of life, and may enter the city by the gates. Outside are the dogs, the sorcerers, the sexually immoral persons, the murderers, the idolaters, and everyone who loves and practices lying.
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I, Jesus, have sent My angel to testify to you of these things for the churches. I am the root and the descendant of David, the bright morning star.” (Rev 22:12-16)
the whole passage so you can see Who is speaking
“Thus says the LORD, the King of Israel and his Redeemer, the LORD of hosts: ‘
I am the first and I am the last, And there is no God besides Me.'(Is 44:6)
Listen to Me, O Jacob, even Israel whom I called; I am He,
I am the first, I am also the last. (Is 48:12)
who is speaking in Isaiah?