Council of Carthage of 411

“Our adversaries argue against us who defend the purity of the church that it will have mixed within it at the same time good and bad up to the end of the age. For this reason we demonstrate that the church of the Lord is called nearly everywhere in the divine Scriptures "holy" and "without spot." In Isaiah, "say to the daughter of Zion, behold, your Savior comes bringing his reward and work with him, and he will call that people holy and redeemed by the Lord; and you will be called a desired city and not an abandoned one." … For Paul clearly shows this: "Christ loved the church and gave himself up for it that he might sanctify it, washing it in the water of the word and joining it to himself, not having a spot or stain or anything like that, but holy and spotless."”