'Brother' in the Bible

Paul, a prisoner of Christ Jesus, and Timothy our brother,To Philemon our beloved brother and fellow worker,

For I have come to have much joy and comfort in your love, because the hearts of the saints have been refreshed through you, brother.

no longer as a slave, but more than a slave, a beloved brother, especially to me, but how much more to you, both in the flesh and in the Lord.

Yes, brother, let me benefit from you in the Lord; refresh my heart in Christ.