'Brother' in the Bible

Paul, an Apostle of Christ Jesus by the will of God--and our brother Timothy: To the Church of God in Corinth, with all God's people throughout Greece.

yet, obtaining no relief for my spirit because I did not find our brother Titus, I bade them farewell and went on into Macedonia.

And we send with him the brother whose praises for his earnestness in proclaiming the Good News are heard throughout all the Churches.

And we send with them our brother, of whose zeal we have had frequent proof in many matters, and who is now more zealous than ever through the strong confidence which he has in you.

I begged Titus to visit you, and sent our other brother with him. Did Titus gain any selfish advantage over you? Were not he and I guided by one and the same Spirit, and did we not walk in the same steps?