32 And we declare to you glad tidings — that promise which was made to the fathers.
33 God has fulfilled this for us their children, in that He has raised up Jesus. As it is also written in the second Psalm: ‘You are My Son, today I have begotten You.’
34 And that He raised Him from the dead, no more to return to corruption, He has spoken thus: ‘I will give you the sure mercies of David.’
35 Therefore He also says in another Psalm: ‘You will not allow Your Holy One to see corruption.’
36 “For David, after he had served his own generation by the will of God, fell asleep, was buried with his fathers, and saw corruption;
37 but He whom God raised up saw no corruption.
fulfilled (v.33) = completely fulfilled
You are My Son, today I have begotten You (v.33) — from Psalm 2:7 — The resurrection was the official proof and proclamation that Jesus Christ is the Son of God — And declared to be the Son of God with power according to the Spirit of holiness, by the resurrection from the dead (Romans 1:4).
I will give you the sure mercies of David (v.34 — from Isaiah 55:3 — the sacred and sure promises to David. The resurrection was a seal and fulfillment of those promises.
You will not allow Your Holy One to see corruption (v.35) — from Psalm 16:10
David (v.36) — David died, therefore the prophecy in Psalm 16 could not refer to him but had to refer to the Messiah.
his own generation (v.36) — David served while he was alive. Christ’s service and its results are permanent.
Thus, while Israel, as a nation, had crucified Christ and was even now standing by that awful deed, all had progressed according to God’s immutable plan. Christ was alive in spite of His enemies, and gloriously able and ready to save. — Acts Dispensationally Considered, by C.R. Stam, page 201.