David sought to show kindness to any remaining descendants of Saul to fulfill his promise to Jonathan. He found that Jonathan's son Mephibosheth was alive but lame. David summoned Mephibosheth and assured him that he would show kindness by restoring his lands and allowing him to dine at the king's table as one of the king's sons. Mephibosheth was granted this generosity and provision from the king due to David's loyalty to his promise to Jonathan.