'Brother' in the Bible

Paul, a prisoner for Christ Jesus, and Timothy our brother: To Philemon our dearly-loved fellow labourer--

I give continual thanks to my God while making mention of you, my brother, in my prayers,

For I have found great joy and comfort in your love, because the hearts of God's people have been, and are, refreshed through you, my brother.

no longer as a slave, but as something better than a slave--a brother peculiarly dear to me, and even dearer to you, both as a servant and as a fellow Christian.

Yes, brother, do me this favour for the Lord's sake. Refresh my heart in Christ.

Greetings to you, my brother, from Epaphras my fellow prisoner for the sake of Christ Jesus;