Verse 33The first raising up, (Acts 13:33), is obviously not the same as the second raising up, (Acts 13:34), because the first is a raising up as the Prophet who was to come according to the Word of the Father in the Torah, (Deut 18:17-19), while the second raising up concerns the same one, the Meshiah, being raised up from the dead. This is indeed stated in the Torah and the Prophets, most importantly in Deut 18:18 because it is the Word of the Father.
Paul cites Psalm 2:7 to affirm that the divine Sonship of the Lord is unmistakably proven through His begettal and resurrection (Luke 1:35; Romans 1:4; Colossians 1:18).
He also refers to this psalm elsewhere, as seen in Acts 13 and in his writings to the Hebrews (Hebrews 1:5; 5:5).
The declaration, “This day have I begotten thee,” is presented in the psalm as a prophecy to be fulfilled at the Lord’s inauguration as “King upon the holy hill of Zion.” Such a royal appointment could only apply to one who was “made strong” for Yahweh (Psalm 80:17), who perfectly revealed the divine character in mortal flesh (John 1:14), and who was delivered from death to receive divine nature (Hebrews 5:7, which also cites Psalm 2:7).
Although Christ has already been appointed to this exalted office, his formal enthronement as King is yet to take place.
Verse 34
“And as concerning that” This phrase introduces Paul’s proof of the statement made in verse 30.
“He raised Him up from the dead” The term “raised” (anastēsen) repeats the wording from verse 33 but, in this instance, refers specifically to the Lord’s resurrection to immortality (see its use in John 6:39, 40, 44, 54). Paul now cites several prophecies to support his second key point: that God has provided a Saviour (v. 23).
“Now no more to return to corruption” This highlights Christ’s immortalisation, contrasting it with the natural process of decay brought into the world through Adam’s sin (Genesis 3:19; cf. 2 Peter 1:4).
“He said on this wise: I will give you the sure mercies of David” Quoted from Isaiah 55:3, this connects the promises made to David (cf. Acts 13:22–23) with the granting of eternal life to the Lord Jesus Christ.
The phrase “the sure mercies of David” refers to the ultimate fulfilment of the Davidic covenant in immortality (2 Samuel 7:12–16), a truth that David himself acknowledged in the next passage cited by Paul.
All very clear @Wick Stick
