If he be constant - The conditional character of the promise made to David, as to the continuance of his posterity on the Jewish throne (marginal reference; 2 Samuel 7:14), is now clearly declared.
Related Commentaries of 1 Chronicles 28:7
1 Chronicles 28:7
7 Moreover I will establish his kingdom for ever, if he be constantc to do my commandments and my judgments, as at this day.