'Brother' in the Bible

Paul, a called apostle of Jesus Christ, through the will of God, and Sosthenes the brother,

and now, I did write to you not to keep company with him, if any one, being named a brother, may be a whoremonger, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner -- with such a one not even to eat together;

but brother with brother doth go to be judged, and this before unbelievers!

And to the rest I speak -- not the Lord -- if any brother hath a wife unbelieving, and she is pleased to dwell with him, let him not send her away;

And, if the unbelieving doth separate himself -- let him separate himself: the brother or the sister is not under servitude in such cases, and in peace hath God called us;

and the brother who is infirm shall perish by thy knowledge, because of whom Christ died?

wherefore, if victuals cause my brother to stumble, I may eat no flesh -- to the age -- that my brother I may not cause to stumble.

and concerning Apollos our brother, much I did entreat him that he may come unto you with the brethren, and it was not at all his will that he may come now, and he will come when he may find convenient.