1 Chronicles 19:3-4

3the Ammonite officials said to Hanun, “Do you really think David is trying to honor your father by sending these messengers to express his sympathy? No, his servants have come to you so they can get information and spy out the land!”

4So Hanun seized David’s servants and shaved their beards off. He cut off the lower part of their robes so that their buttocks were exposed and then sent them away.