This is a subsidiary post of Other Names for the Disciples of Jesus Christ.
Subsidiary post: Believers Are Brothers.
We who believe in Christ today are all brothers. None of us has authority over another. If some of us are stronger in faith than others, then we should use that strength to serve our younger brethren – not lord it over them.
As Jesus promised (vowed) “I will be a father to you,” so we should promise (vow) “I will be a brother to you.”
Matthew 23:8 – “…for One is your Teacher, and you are all brothers.” – Jesus Christ the Lord is the only one who should be exalted among us (Isaiah 2:11, 17; Jeremiah 31:34).
Romans 8:29 – “…so that He would be the firstborn among many brethren;”
2 Thessalonians 3:13, 14, 15 – “But as for you, brethren, do not grow weary of doing good. If anyone does not obey our instruction in this letter, take special note of that person and do not associate with him, so that he will be put to shame. Yet do not regard him as an enemy, but admonish him as a brother.”
James 5:19-20 – “My brethren, if any among you strays from the truth…” – Note that this is an admonition to “brethren.” One believer rebuking another ought to be more common than a believer rebuking a nonbeliever (1 Corinthians 5:9-13).
1 Peter 1:22 – “…purified your souls for a sincere love of the brethren…” – The love we owe to our brethren is to be sincere and fervent.
1 Peter 2:17 – “Honor all people, love the brotherhood, fear God…” – Note that the brotherhood is owed a greater degree of care. It is typical that families have the first responsibility to care for each other (1 Timothy 3:5; 5:8).
1 Peter 5:9 – “…are being accomplished by your brethren who are in the world.” – The NASB has a marginal note on “brethren” that reads “Lit brotherhood.”
1 Peter 5:12 – “Through Silvanus, our faithful brother (for so I regard him)…”