2 Samuel 10:2-3

Then David said, “I will show kindness to Hanun the son of Nahash, just as his father did to me.” So David sent [a letter along with] some of his servants to console him in regard to his father’s death; and David’s servants came into the land of the Ammonites. But the princes of the Ammonites [were suspicious and] said to Hanun their lord, “Do you think that David is honoring your father because he has sent comforters to you? Has David not sent his servants to you in order to search the city, to spy it out and overthrow it?”