1 Chronicles 19:2-5

2And David said, I will show kindness unto Hanun the son of Nahash, because his father showed kindness to me. So David sent messengers to comfort him concerning his father. And David’s servants came into the land of the children of Ammon to Hanun, to comfort him. 3But the princes of the children of Ammon said to Hanun, Thinkest thou that David doth honor thy father, in that he hath sent comforters unto thee? are not his servants come unto thee to search, and to overthrow, and to spy out the land? 4So Hanun took David’s servants, and shaved them, and cut off their garments in the middle, even to their buttocks, and sent them away. 5Then there went certain persons, and told David how the men were served. And he sent to meet them; for the men were greatly ashamed. And the king said, Tarry at Jericho until your beards be grown, and then return.