>> “How do you appoint an elder? Is he an elder across any denomination or only in that particular one?” <<
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There are no denominations in Yeshua’s assembly.
You are either a part of it or you are not.
Yeshua’s assembly is not a human corporation with human leaders, it is whenever and wherever two or more gather in his name.
It owns no buildings, has no Earthly wealth or symbols, nor “great men” to lead it.
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Right, so that’s it, then. Good night?
http://biblehub.com/matthew/28-18.htm
Then Jesus came to them and said, “All authority in heaven and on earth has been given to me.
1. The Greek is perfectly clear. Who gave Jesus his authority?
http://biblehub.com/matthew/28-19.htm
Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit,
2. Who can baptize and what is the methodology?
http://biblehub.com/matthew/28-20.htm
and teach them to obey every command which I have given you. And remember, I am with you always, day by day, until the Close of the Age.”
3. Which commands/ordinances are they to obey?
And this is just Matthew.