1 Chronicles 19:2-5

David said, “I am going to show loyalty to Hanun because his father, Nahash, was always loyal to me.” So David sent messengers 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, “Do you really think these men are coming here to honor your father? No! David has sent them to spy out the land so they can come in and conquer it!” So Hanun seized David’s ambassadors and shaved them, cut off their robes at the buttocks, and sent them back to David in shame. When David heard what had happened to the men, he sent messengers to tell them, “Stay at Jericho until your beards grow out, and then come back.” For they felt deep shame because of their appearance.