Build thee a sure house, i.e. firmly settle thee and thy posterity in the throne, as this or the like phrase is used, 2 Samuel 7:16,27; but he doth not say he would do this for ever, as is there said of David's house 1 Kings 11:16.
Related Commentaries of 1 Kings 11:38
1 Kings 11:38
38 And it shall be, if thou wilt hearken unto all that I command thee, and wilt walk in my ways, and do that is right in my sight, to keep my statutes and my commandments, as David my servant did; that I will be with thee, and build thee a sure house, as I built for David, and will give Israel unto thee.