John Gills Exposition of the Bible Commentary - Psalms 89:36
His seed shall endure for ever ,.... This is a confirmation by his oath of what he had before said, Psalm 89:29 which may be understood either of the perseverance of particular believers, of everyone of the spiritual seed of Christ; or of the duration of the church in general, throughout all ages, as before observed; and these being matters of moment and importance, and of which there are sometimes doubts in the minds of the Lord's people about them, and that they may be firmly believed by... 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