Apostolic Constitutions, on 1Pet 2:9

“But you are a chosen generation, a kingly priesthood, a holy nation, a purchased people: that you may declare his virtues, who hath called you out of darkness into his marvellous light:”

“Hear this, you of the laity also, the elect Church of God. For the people were formerly called "the people of God," [Exodus 19:5-6] and "an holy nation." [Hebrews 12:23] You, therefore, are the holy and sacred "Church of God, enrolled in heaven, a royal priesthood, an holy nation, a peculiar people," [1 Peter 2:9] a bride adorned for the Lord God, a great Church, a faithful Church.”

Imported from an open dataset — not yet checked against the printed edition.