'Brother' in the Bible

Paul, an apostle of Christ Jesus through the will of God, and Timothy our brother, to the assembly of God which is at Corinth, with all the saints who are in the whole of Achaia:

I had no relief for my spirit, because I didn't find Titus, my brother, but taking my leave of them, I went out into Macedonia.

We have sent together with him the brother whose praise in the Good News is known through all the assemblies.

We have sent with them our brother, whom we have many times proved earnest in many things, but now much more earnest, by reason of the great confidence which he has in you.

I exhorted Titus, and I sent the brother with him. Did Titus take any advantage of you? Didn't we walk in the same spirit? Didn't we walk in the same steps?