Mark 13:6

Cyprian Epistle LXXIV

But that not all who call on the name of Christ are heard, and that their invocation cannot obtain any grace, the Lord Himself manifests, saying, "Many shall come in my name, saying, I am Christ, and shall deceive many."[18]

Cyprian Treatise I On the Unity of the Church

He professes himself to be a Christian in such a way as the devil often feigns himself to be Christ, as the Lord Himself forewarns us, and says, "Many shall come in my name, saying, I am Christ, and shall deceive many."[44]