'Brother' in the Bible

Paul, a prisoner [for the sake] of Christ Jesus (the Messiah, the Anointed), and our brother Timothy,To Philemon our dearly beloved friend and fellow worker,

For I have had great joy and comfort and encouragement from your love, because the hearts of the saints (God’s people) have been refreshed through you, my brother.

no longer as a slave, but [as someone] more than a slave, as a brother [in Christ], especially dear to me, but how much more to you, both in the flesh [as a servant] and in the Lord [as a fellow believer].

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