Acts 13:33

that God has fulfilled this unto our children, raising up Jesus, as in the second Psalm it has been written, Thou art my Son, this day have I begotten thee.

Hebrews 5:5

Likewise Christ also did not glorify himself to become a high priest, but the one having spoken to him, Thou art my Son, this day have I begotten thee:

Hebrews 1:5-6

For to which one of the angels at any time did he say, Thou art my Son, this day have I begotten thee? and again, I will be unto him a Father, and he shall be unto me a 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 one of the angels at any time did he say, Thou art my Son, this day have I begotten thee? and again, I will be unto him a Father, and he shall be unto me a Son?
Hebrews 5:5
Likewise Christ also did not glorify himself to become a high priest, but the one having spoken to him, Thou art my Son, this day have I begotten thee: