"David now encounters Ziba (vv. 1-4), the first of two men with links to the house of Saul (the other is Shimei [vv. 5-14]). Although Ziba attempts to ingratiate himself to him and Shimei curses him, David treats each with courtesy. The brief account of the king's kindness to Ziba (vv. 1-4) has obvious connections with the narrative of his kindness to Mephibosheth (ch. 9) . . ."244
Ziba's report of Mephibosheth's reaction to the news that Absalom had rebelled seems to have been untrue (cf. 19:24-28). Perhaps he believed Absalom would kill his master and then David would reward him. David accepted Ziba's report too quickly without getting all the facts perhaps because Ziba showed himself to be a friend of David by sustaining him in his flight. We sometimes accept a friend's analysis of the motives of another person too quickly if we do not bother to get all the facts. Here David slipped because he too willingly accepted the complimentary words of a friend.