'Brethren' in the Bible

We ought always and indeed are morally obligated [as those in debt] to give thanks to God for you, brothers and sisters, as is fitting, because your faith is growing ever greater, and the [unselfish] love of each one of you toward one another is continually increasing.

Now in regard to the coming of our Lord Jesus Christ and our gathering together to meet Him, we ask you, brothers and sisters,

But we should and are [morally] obligated [as debtors] always to give thanks to God for you, believers beloved by the Lord, because God has chosen you from the beginning for salvation through the sanctifying work of the Spirit [that sets you apart for God’s purpose] and by your faith in the truth [of God’s word that leads you to spiritual maturity].

So then, brothers and sisters, stand firm and hold [tightly] to the traditions which you were taught, whether by word of mouth or by letter from us.

Finally, brothers and sisters, pray continually for us that the word of the Lord will spread rapidly and be honored [triumphantly celebrated and glorified], just as it was with you;

Now we command you, believers, in the name of our Lord Jesus Christ and by His authority, that you withdraw and keep away from every brother or sister who leads an undisciplined life and does not live in accordance with the tradition and teaching that you have received from us.

And as for [the rest of] you, believers, do not grow tired or lose heart in doing good [but continue doing what is right without weakening].