Psalms 89:4

“Thy seed will I establish for ever, etc.] Meaning not the natural seed of David, at least not only them; whose family was indeed preserved, though in very low circumstances, until the Messiah came, who sprung from thence, (<420127>Luke 1:27 2:4 <441323>Acts 13:23), but the spiritual seed of Christ, to whom it was promised that he should have a seed, and should see and enjoy it, and which should endure for ever; (see <198929>Psalm 89:29,36 <235921> Isaiah 59:21), and so he always has had a seed to serve him in all generations, in the worst of times, and will; and who are established in him, and will be kept and preserved by him, and whom he will present to his Father, saying, “Lo, I and the…”

“Thy seed will I establish for ever - Thy children; thy posterity. The reference is to his successors on the throne. The promise was that there should not fail to be one on his throne; that is, that his dynasty should never become extinct. See 2 Samuel 7:16 : “And thy house and thy kingdom shall be established forever before thee: thy throne shall be established forever.” Compare also 1 Kings 2:4. The word rendered “establish” means properly to fit; then, to make firm; to put on a solid basis. And build up thy throne - It shall be kept up; it shall be like a building that is constantly progressing toward completion. The meaning is, that it would not fail. He would not begin the work, and then…”

“Build up - I will perpetuate the kingdom to thy posterity; which was promised upon condition, and was literally accomplished in Christ. Psalms 89:5”

“Psa 89:1, Psa 89:29, Psa 89:36, Psa 72:17, Psa 132:12; Sa2 7:12-16, Sa2 7:29; Kg1 9:5; Ch1 17:10-14; Ch1 22:10; Isa 9:6, Isa 9:7; Zac 12:8; Luk 1:32, Luk 1:33, Luk 20:41-44; Act 13:32-37; Rom 1:3, Rom 1:4, Rom 15:12; Phi 2:9-11; Rev 22:16 Psalms 89:5”