John Gills Exposition of the Bible Commentary - Psalms 89:27
Also I will make him my firstborn ,.... Or, "make him the firstborn"; make him great, as Jarchi interprets it; give him the blessing, the double portion of inheritance: so Christ is made most blessed for ever, and has all spiritual blessings in his hands; and is heir of all things, and his people joint-heirs with him. Christ is God's "firstborn", or "first begotten", Hebrews 1:6 , being begotten by him, and of him; and his firstbegotten, though none begotten after him; as the first that... 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