'Brother' in the Bible

Everyone has to be on guard against his friend.Don’t trust any brother,for every brother will certainly deceive,and every friend spread slander.

Therefore, this is what the Lord says concerning Jehoiakim son of Josiah, king of Judah:They will not mourn for him, saying,“Woe, my brother!” or “Woe, my sister!”They will not mourn for him, saying,“Woe, lord! Woe, his majesty!”

This is what each man is to say to his friend and to his brother, ‘What has the Lord answered?’ or ‘What has the Lord spoken?’

No longer will one teach his neighbor or his brother, saying, ‘Know the Lord,’ for they will all know Me, from the least to the greatest of them”—this is the Lord’s declaration. “For I will forgive their wrongdoing and never again remember their sin.”

so each man would free his male and female Hebrew slaves and no one would enslave his Judean brother.

At the end of seven years, each of you must free his Hebrew brother who sold himself to you. He may serve you six years, but then you must send him out free from you. But your ancestors did not obey Me or pay any attention.

“Therefore, this is what the Lord says: You have not obeyed Me by proclaiming freedom, each man for his brother and for his neighbor. I hereby proclaim freedom for you”—this is the Lord’s declaration—“to the sword, to plague, and to famine! I will make you a horror to all the earth’s kingdoms.