Novatian

Next, well-ordered reason and the authority of our faith bid us (in the words and the writings of our Lord set down in orderly fashion) to believe, after these things, also in the Holy Spirit, who was in the times past promised to the church and duly bestowed at the appointed, favorable moment. He was promised by the prophet Joel but bestowed through Christ. "In the last days," says the prophet, "I will pour out from my spirit upon my servants and handmaids." And the Lord himself said, "Receive the Holy Spirit. If you forgive the sins of any, they are forgiven; if you retain the sins of any, they are retained."