Irenaeus Against Heresies Book III

Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God; and every spirit which separates Jesus Christ is not of God, but is of antichrist."[297]

Tertullian Against Marcion Book V

by the Apostle John, who says that "already many false prophets are gone out into the world," the fore-runners of Antichrist, who deny that Christ is come in the flesh,[740]

Dubious Hippolytus Fragments

Believe not every spirit, because many false prophets are gone out into the world."[37]

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Old Testament