'Brother' in the Bible

So Ananias left and went to that house. He laid his hands on Saul and said, "Brother Saul, the Lord Jesus, who appeared to you on the road as you were traveling, has sent me so that you may see again and be filled with the Holy Spirit."

He even had James, the brother of John, killed with a sword.

When they heard about it, they praised God and told him, "You see, brother, how many tens of thousands of believers there are among the Jews, and all of them are zealous for the Law.

came to me. He stood beside me and said, "Brother Saul, receive your sight!' At that moment I could see him.