2 Samuel 10:9-10

10:9 When Joab saw that the battle would be fought on two fronts, he chose some of Israel’s best men and deployed them against the Arameans. 10:10 He put his brother Abishai in charge of the rest of the army and they were deployed against the Ammonites.

2 Samuel 10:14

10:14 When the Ammonites saw the Arameans flee, they fled before his brother Abishai and went into the city. Joab withdrew from fighting the Ammonites and returned to Jerusalem.