John Gills Exposition of the Bible Commentary - Psalms 89:30
If his children forsake my law ,.... The same with the seed before mentioned, the children of the Messiah: it is not said "if he forsakes", which cannot be supposed of Christ, because he knew no sin, nor did any; which yet might be supposed of David, had he been literally meant; but not he, nor his natural children, but the spiritual seed of mystical David, are here designed, who may sin, and do sin, of which there is too much proof and evidence; and who sin not only through infirmity, but... read more
Matthew Henry's Complete Commentary - Psalms 89:19-37
The covenant God made with David and his seed was mentioned before (Ps. 89:3, 4); but in these verses it is enlarged upon, and pleaded with God, for favour to the royal family, now almost sunk and ruined; yet certainly it looks at Christ, and has its accomplishment in him much more than in David; nay, some passages here are scarcely applicable at all to David, but must be understood of Christ only (who is therefore called David our king, Hos. 3:5), and very great and precious promises they are... read more