Who is the “he” in lines 9 & 10, and where was he previously mentioned, before line 9?

 

Revelation 19:9 And he saith unto me, Write, Blessed are they which are called unto the marriage supper of the Lamb. And he saith unto me, These are the true sayings of God.

10 And I fell at his feet to worship him. And he said unto me, See thou do it not: I am thy fellowservant, and of thy brethren that have the testimony of Jesus: worship God: for the testimony of Jesus is the spirit of prophecy.

 

It looks like he is a Christian, in heaven, else why say that he is of John’s brethren?

However, when I asked my Brother, he wrote to me:

I’m thinking angel because he says that he was John’s ‘fellow servant’ as well as John’s brethren’s ‘fellow servant’

 

“I am thy fellowservant, and of thy brethren”

 

He didn’t refer to John’s brethren as his brethren too.

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What do you all think?