Acts 13:33

and has now fulfilled to [us], their children, in raising up Jesus [to be the Messiah], just as it was written in the second Psalm [2:7]: "You [i.e., Jesus] are my Son; this day I have become Your Father."

Hebrews 5:5

So, Christ also did not take on Himself the honor of becoming head priest, but God said to Him [Psa. 2:7], "You are my Son; today I have conceived you."

Hebrews 1:5-6

For, to which angel did God ever say [Psa. 2:7], "You are my Son, today I have conceived you"? And again [II Sam. 7:14], "I will be His Father, and He will be my Son"?

Treasury of Scripture Knowledge

Summary

God hath fulfilled the same unto us their children, in that he hath raised up Jesus again; as it is also written in the second psalm, Thou art my Son, this day have I begotten thee.

Bible References

Thou art

Hebrews 1:5
For, to which angel did God ever say [Psa. 2:7], "You are my Son, today I have conceived you"? And again [II Sam. 7:14], "I will be His Father, and He will be my Son"?
Hebrews 5:5
So, Christ also did not take on Himself the honor of becoming head priest, but God said to Him [Psa. 2:7], "You are my Son; today I have conceived you."