'Brother' in the Bible

and sent Timotheus, our brother and fellow-workman under God in the glad tidings of Christ, to confirm you and encourage you concerning your faith,

not overstepping the rights of and wronging his brother in the matter, because the Lord is the avenger of all these things, even as we also told you before, and have fully testified.

He therefore that in this disregards his brother, disregards, not man, but God, who has given also his Holy Spirit to you.