'Brother' in the Bible

Paul, prisoner of Christ Jesus, and Timotheus the brother, to Philemon the beloved and our fellow-workman,

For we have great thankfulness and encouragement through thy love, because the bowels of the saints are refreshed by thee, brother.

not any longer as a bondman, but above a bondman, a beloved brother, specially to me, and how much rather to thee, both in the flesh and in the Lord?

Yea, brother, I would have profit of thee in the Lord: refresh my bowels in Christ.