'Brother' in the Bible

Paul, called to be an Apostle of Christ Jesus through the will of God--and our brother Sosthenes:

Why, who gives you your superiority, my brother? Or what have you that you did not receive? And if you really did receive it, why boast as if this were not so?

But what I meant was that you were not to associate with any one bearing the name of "brother," if he was addicted to fornication or avarice or idol-worship or abusive language or hard-drinking or greed of gain. With such a man you ought not even to eat.

I say this to put you to shame. Has it come to this, that there does not exist among you a single wise man competent to decide between a man and his brother,

but brother goes to law with brother, and that before unbelievers?

To the rest it is I who speak--not the Lord. If a brother has a wife who is an unbeliever, and she consents to live with him, let him not send her away.

For, in such cases, the unbelieving husband has become--and is--holy through union with a Christian woman, and the unbelieving wife is holy through union with a Christian brother. Otherwise your children would be unholy, but in reality they have a place among God's people.

Why, your knowledge becomes the ruin of the weak believer--your brother, for whom Christ died!

Therefore if what I eat causes my brother to fall, never again to the end of my days will I touch any kind of animal food, for fear I should cause my brother to fall.

As for our brother Apollos, I have repeatedly urged him to accompany the brethren who are coming to you: but he is quite resolved not to do so at present. He will come, however, when he has a good opportunity.