'Brother' in the Bible

So Ananias left and entered the house. Then he placed his hands on him and said, “Brother Saul, the Lord Jesus, who appeared to you on the road you were traveling, has sent me so that you can regain your sight and be filled with the Holy Spirit.”

and he killed James, John’s brother, with the sword.

When they heard it, they glorified God and said, “You see, brother, how many thousands of Jews there are who have believed, and they are all zealous for the law.

came and stood by me and said, ‘Brother Saul, regain your sight.’ And in that very hour I looked up and saw him.