To observe where the city is weakest, and may soonest be taken. The ground of this suspicion was, partly, the conscience of their ill deserts and carriage towards the Israelites, whose quarrel David had espoused; partly, the opinion they had of David's policy; and partly, the severity of God's law, particularly against them, Deuteronomy 23:6, which might easily come to their ears. And they knew David was a zealous asserter of God's laws.
Related Commentaries of 2 Samuel 10:3
2 Samuel 10:3
3 And the princes of the children of Ammon said unto Hanun their lord, Thinkesta thou that David doth honour thy father, that he hath sent comforters unto thee? hath not David rather sent his servants unto thee, to search the city, and to spy it out, and to overthrow it?