'Brothers' in the Bible

But Joab and Abishai [Asahel’s brothers] pursued Abner. When the sun was going down, they came to the hill of Ammah, which is in front of Giah on the way to the wilderness of Gibeon.

Then Abner called out to Joab: “Must the sword devour forever? Don’t you realize this will only end in bitterness? How long before you tell the troops to stop pursuing their brothers?”

“As God lives,” Joab replied, “if you had not spoken up, the troops wouldn’t have stopped pursuing their brothers until morning.”

Abner was very angry about Ish-bosheth’s accusation. “Am I a dog’s head who belongs to Judah?” he asked. “All this time I’ve been loyal to the house of your father Saul, to his brothers, and to his friends and haven’t handed you over to David, but now you accuse me of wrongdoing with this woman!

Besides, you only arrived yesterday; should I make you wander around with us today while I go wherever I can? Go back and take your brothers with you. May the Lord show you kindness and faithfulness.”

You are my brothers, my flesh and blood. So why should you be the last to restore the king?’

Suddenly, all the men of Israel came to the king. They asked him, “Why did our brothers, the men of Judah, take you away secretly and transport the king and his household across the Jordan, along with all of David’s men?”