II Samuel 10:2-3

Then David said, “I will show kindness to Hanun the son of Nahash, as his father showed kindness to me.” So David sent by the hand of his servants to comfort him concerning his father. And David’s servants came into the land of the people of Ammon. And the princes of the people of Ammon said to Hanun their lord, “Do you think that David really honors your father because he has sent comforters to you? Has David not rather sent his servants to you to search the city, to spy it out, and to overthrow it?”