Sworn in truth; not falsely or deceitfully, as men sometimes do, but sincerely and faithfully, what he will inviolably observe and fulfil, as the next clause expounds this. Of the fruit of thy body; some of thy posterity.
Related Commentaries of Psalms 132:11
Psalms 132:11
11 The LORD hath sworn in truth unto David; he will not turn from it; Of the fruit of thy bodyb will I set upon thy throne.