What does 2 Samuel 2:26 mean?

Abner called out to Joab, 'Are we going to keep killing each other forever? Don't you realize this will only end in bitterness? How long before you tell your men to stop chasing their own brothers?' 2 Samuel 2:26 - Modern Text Bible

(Abner appeals to Joab to end the bloodshed, reminding him they're all Israelites—brothers.)