2 Samuel 10:11

10:11 Joab said, “If the Arameans start to overpower me, you come to my rescue. If the Ammonites start to overpower you, I will come to your rescue.

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.

2 Samuel 12:26-31

David’s Forces Defeat the Ammonites

12:26 So Joab fought against Rabbah of the Ammonites and captured the royal city. 12:27 Joab then sent messengers to David, saying, “I have fought against Rabbah and have captured the water supply of the city. 12:28 So now assemble the rest of the army and besiege the city and capture it. Otherwise I will capture the city and it will be named for me.”

12:29 So David assembled all the army and went to Rabbah and fought against it and captured it. 12:30 He took the crown of their king from his head – it was gold, weighed about seventy-five pounds, and held a precious stone – and it was placed on David’s head. He also took from the city a great deal of plunder. 12:31 He removed the people who were in it and made them do hard labor with saws, iron picks, and iron axes, putting them to work at the brick kiln. This was his policy with all the Ammonite cities. Then David and all the army returned to Jerusalem.

2 Samuel 12:1

Nathan the Prophet Confronts David

12:1 So the Lord sent Nathan to David. When he came to David, Nathan said, “There were two men in a certain city, one rich and the other poor.

2 Samuel 18:11

18:11 Joab replied to the man who was telling him this, “What! You saw this? Why didn’t you strike him down right on the spot? I would have given you ten pieces of silver and a commemorative belt!”