'Sister' in the Bible

I, a ruler in the church, send word to the noble sister who is of God's selection, and to her children, for whom I have true love; and not only I, but all who have knowledge of what is true;

And now, my sister, I make a request to you, not sending you a new law, but the law which we had from the first, that we have love for one another.

The children of thy elect sister greet thee. Amen.