Commentators overwhelmingly agree that this promise has a dual fulfillment. In the short term, it refers directly to David's son, Solomon, who would build the temple and have an established kingdom. However, its ultimate and complete fulfillment is found in Jesus Christ, the 'Son of David.' As scholars like Barnes and Henry note, only Christ's kingdom is truly established 'forever,' making this one of the Old Testament's most significant Messianic prophecies.