1 John 2:23

Cyprian Treatise XI Exhortation to Martyrdom Addressed to Fortunatus

John too: "Whosoever denieth the Son, the same hath not the Father; he that acknowledgeth the Son, hath both the Son and the Father."[39]

Cyprian Treatise XII Three Books of Testimonies Against the Jews

Also in the Epistle of John: "Whosoever denieth the Son, the same also hath not the Father. He that confesseth the Son, hath both the Son and the Father."[300]

Origen Commentary on John Book II

And how is it if, as many of Christ's true disciples were honoured by having thus to witness for Him, so the prophets received from God as their special gift that of understanding about Christ and announcing Him before, and that they taught not only those living after Christ's advent how they should regard the Son of God, but those also who lived in the generations before Him? As he who in these times does not know the Son has not the Father either,[104]