'Brother' in the Bible

So Ananias departed and entered into the house, and placing [his] hands on him, he said, "Brother Saul, the Lord Jesus, who appeared to you on the road by which you came, has sent me so that you may regain [your] sight and be filled with the Holy Spirit."

So he executed James the brother of John with a sword.

And [when] they heard [this], they began to glorify God. And they said to him, "You see, brother, how many ten thousands there are among the Jews who have believed, and they are all zealous adherents of the law.

came to me and stood by [me] [and] said to me, 'Brother Saul, regain [your] sight!' And [at that] same time I looked up at him [and saw him].