Acts 13:33

he has fulfilled for us, their children, by raising up Jesus. As it is also written in the second Psalm: 'You are my Son; today I have begotten you.'

Hebrews 5:5

So also Christ did not exalt himself to become a high priest, but it was he who said to him, "You are my son, today I have begotten you";

Hebrews 1:5-6

For to which of the angels did God ever say, "You are my son, today I have begotten you"? And again, "I will be a father to him and he shall be a son to me"?

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 of the angels did God ever say, "You are my son, today I have begotten you"? And again, "I will be a father to him and he shall be a son to me"?
Hebrews 5:5
So also Christ did not exalt himself to become a high priest, but it was he who said to him, "You are my son, today I have begotten you";