2 Samuel 16:3

thy master's son Mephibosheth is called the son, i.e. grandson, of Ziba's lord Saul in ch. 2 Samuel 9:9. David was hurt by Mephibosheth's apparent ingratitude.

for he said, To day, &c. That Ziba was calumniating Mephibosheth is sufficiently obvious. How could Mephibosheth, an insignificant cripple, who had never claimed the crown, or taken any part in politics, expect to be made king, even in the confusion of parties which might ensue upon Absalom's rebellion? Ziba's story was an audacious fiction, invented in the hope of getting a grant of the estate which he was cultivating for Mephibosheth's benefit, and in spite of its improbability, it passed muster in the haste and confusion of the moment.