The Son is NOT speaking in Rev 1:8 above. It is the Father. Rev 1:4 is a greeting from the Father and verse 5 is a greeting from the Son. It is the being in verse 4 that is “which is, and which was, and which is to come” Do not be misled by publishers who put verse 8 in red letters, thus deceiving the readers.
Please consider.
Rev 1:8 I am Alpha and Omega, the beginning and the ending, saith the Lord,
which is, and
which was, and
which is to come, the Almighty.
Rev 1:11 Saying, I am Alpha and Omega, the first and the last: . . .
Rev 1:12 And
I turned to see the voice that spake with me. And being turned, I saw seven golden candlesticks;
Rev 1:13 And in the midst of the seven candlesticks
one like unto the Son of man, clothed with a garment down to the foot, and girt about the paps with a golden girdle.
Rev 1:14 His head and
his hairs
were white like wool, as white as snow; and his eyes
were as a flame of fire;
Rev 1:15 And his feet like unto fine brass, as if they burned in a furnace; and his voice as the sound of many water.
Rev 1:17 And
when I saw him, I fell at his feet as dead. And he laid his right hand upon me, saying unto me,
Fear not; I am the first and the last:
Rev 1:18
I am he that liveth, and
was dead; and, behold,
I am alive for evermore, Amen; and have the keys of hell and of death.
Rev 1:19 Write the things which thou hast seen, and the things which are, and the things which shall be hereafter; - In this verse Jesus is talking to John
The speaker is YHWH. The Father is the only being known as YHWH. Besides the Father, there is no God (no one true Elohim).
Next Jesus is Jehovah or YHWH also.
Isa 40:3 The voice of him (John the Baptist) that crieth in the wilderness, Prepare ye the way of the LORD (Jesus), make straight in the desert a highway for our God.
Isa 43:11 I,
even I,
am the LORD (Jesus); and beside me
there is no saviour.
Isa 43:14 Thus saith the LORD (Jesus), your redeemer, the Holy One of Israel
Isa 43:15 I
am the LORD (Jesus), your Holy One, the creator of Israel, your King.