'Brethren' in the Bible

I do not want you to be unaware, brothers and sisters, that many times I have planned to come to you, (and have been prevented so far) so that I may have some fruit [of my labors] among you, even as I have among the rest of the Gentiles.

Or do you not know, brothers and sisters (for I am speaking to those who know the Law), that the Law has jurisdiction [to rule] over a person as long as he lives?

Therefore, my fellow believers, you too died to the Law through the [crucified] body of Christ, so that you may belong to another, to Him who was raised from the dead, in order that we may bear fruit for God.

So then, brothers and sisters, we have an obligation, but not to our flesh [our human nature, our worldliness, our sinful capacity], to live according to the [impulses of the] flesh [our nature without the Holy Spirit]—

For those whom He foreknew [and loved and chose beforehand], He also predestined to be conformed to the image of His Son [and ultimately share in His complete sanctification], so that He would be the firstborn [the most beloved and honored] among many believers.

For [if it were possible] I would wish that I myself were accursed, [separated, banished] from Christ for the sake [of the salvation] of my brothers, my natural kinsmen,

Brothers and sisters, my heart’s desire and my prayer to God for Israel is for their salvation.

I do not want you, believers, to be unaware of this mystery [God’s previously hidden plan]—so that you will not be wise in your own opinion—that a partial hardening has [temporarily] happened to Israel [to last] until the full number of the Gentiles has come in;

Therefore I urge you, brothers and sisters, by the mercies of God, to present your bodies [dedicating all of yourselves, set apart] as a living sacrifice, holy and well-pleasing to God, which is your rational (logical, intelligent) act of worship.

Personally I am convinced about you, my brothers and sisters, that you yourselves are full of goodness, amply filled with all [spiritual] knowledge, and competent to admonish and counsel and instruct one another.

I urge you, believers, by our Lord Jesus Christ and by the love of the Spirit, to join together with me in your prayers to God in my behalf,

Greet Asyncritus, Phlegon, Hermes, Patrobas, Hermas, and the brothers who are with them.

I urge you, brothers and sisters, to keep your eyes on those who cause dissensions and create obstacles or introduce temptations [for others] to commit sin, [acting in ways] contrary to the doctrine which you have learned. Turn away from them.