2 Samuel 10:1-8

Some time after this, King Nahash of the Ammonites died, and his son Hanun became king. David said, “I am going to show loyalty to Hanun just as his father, Nahash, was always loyal to me.” So David sent ambassadors to express sympathy to Hanun about his father’s death. But when David’s ambassadors arrived in the land of Ammon, the Ammonite commanders said to Hanun, their master, “Do you really think these men are coming here to honor your father? No! David has sent them to spy out the city so they can come in and conquer it!” So Hanun seized David’s ambassadors and shaved off half of each man’s beard, cut off their robes at the buttocks, and sent them back to David in shame. When David heard what had happened, he sent messengers to tell the men, “Stay at Jericho until your beards grow out, and then come back.” For they felt deep shame because of their appearance. When the people of Ammon realized how seriously they had angered David, they sent and hired 20,000 Aramean foot soldiers from the lands of Beth-rehob and Zobah, 1,000 from the king of Maacah, and 12,000 from the land of Tob. When David heard about this, he sent Joab and all his warriors to fight them. The Ammonite troops came out and drew up their battle lines at the entrance of the city gate, while the Arameans from Zobah and Rehob and the men from Tob and Maacah positioned themselves to fight in the open fields.