'Brother' in the Bible

So Ananias left and entered the house, and he laid his hands on Saul and said, “Brother Saul, the Lord Jesus, who appeared to you on the road as you came [to Damascus], has sent me so that you may regain your sight and be filled with the Holy Spirit [in order to proclaim Christ to both Jews and Gentiles].”

And he had James the brother of John put to death with a sword;

And when they heard it, they began glorifying and praising God; and they said to him, “You see, brother, how many thousands of believers there are among the Jews, and they are all enthusiastic supporters of the Law [of Moses].

came to [see] me, and standing near, he said to me, ‘Brother Saul, receive your sight!’ And at that very moment I [recovered my sight and] looked up at him.