Exploring the Meaning of Pareisduno in Greek

παρεισδύνω means “to infiltrate,” and it appears once in the New Testament, in Jude’s warning about certain men entering the community in a hidden way.

Root and Related Words

παρεισδύνω is formed with elements reflected in παρά (para), “from/with/beside” (Strong’s G3844), and εἰς (eis), “toward” (Strong’s G1519), along with δύνω (dyno; δύνω, δῦμι), “to set” (Strong’s G1416). The assembled form aligns with the idea of movement in relation to others (“beside/with”), directed inward (“toward”), and expressed through a verb of motion.

Occurrences

“For there are certain men who crept in secretly, even those who were long ago written about for this condemnation: ungodly men, turning the grace of our God into indecency, and denying our only Master, God, and Lord, Jesus Christ.” (Jude 1:4)

In Jude 1:4, παρεισδύνω describes the manner by which “certain men” enter: their arrival is not presented as open or welcomed, but as an entry accomplished in concealment. The verse frames their presence as already within the sphere Jude addresses—they are not merely approaching from outside but have gained access in a way that avoids notice. This hidden entry is tightly linked to what follows in the sentence: once inside, they are characterized as “ungodly,” and their influence is described in two pointed actions—“turning the grace of our God into indecency” and “denying our only Master, God, and Lord, Jesus Christ.”

Because Jude ties their secret entry to these subsequent outcomes, the verb does more than mark a change of location. It supports Jude’s portrayal of danger that arises from within: the problem is not only what these men teach or do, but the stealthy manner of their introduction, which allows their corrupting work to proceed under cover. In the verse’s logic, infiltration explains how such people can be present among the recipients at all, and it heightens the sense of urgency by showing that the threat has already crossed the boundary into the community’s midst.

Sense and Usage

The sense “to infiltrate” in Jude 1:4 plays out as covert entry into a group with harmful consequence. Jude pairs the hiddenness of the entrance (“crept in secretly”) with the public effects of the intruders’ presence: grace is “turned…into indecency,” and allegiance to “our only Master, God, and Lord, Jesus Christ” is denied. The verb thus serves Jude’s argument by connecting method and result: the concealed approach is the means by which a destructive influence becomes established.

Within this single attestation, infiltration has a social and moral profile. It is not simple movement “toward” a place, but entry “beside/with” others—entry that places the intruders within the same environment as the faithful, close enough to exert influence. Jude’s description implies that infiltration is especially perilous because it bypasses normal recognition: it is the opposite of transparent arrival and accountable speech. The verb’s force is therefore sharpened by its setting: Jude’s concern is for a community that must discern and respond to an internal threat that was introduced quietly.

Jude also sets the infiltration within a broader frame of condemnation: these men are described as “long ago written about for this condemnation.” In this sentence, the infiltrating action is not random or accidental; it belongs to a situation Jude presents as already under divine judgment. The verb helps carry that weight: the intruders’ entry is part of a larger, ominous pattern in which the community’s life is tested by covert corruption.

Imagery

The imagery carried by παρεισδύνω in Jude 1:4 is that of an unnoticed crossing of a boundary—someone slipping alongside others and gaining access without being detected. Jude’s wording evokes the quiet, gradual nature of such an entry, which only becomes visible by its effects: grace distorted into “indecency” and a denial of rightful mastery. The verb leaves the reader with the picture of a community breached from within, not by open confrontation, but by hidden arrival.

Sources: Lexical data from Strong’s Exhaustive Concordance and the Translators Brief Lexicon of Extended Strongs for Greek (STEPBible, CC BY). Occurrence data from the Translators Amalgamated Greek New Testament (STEPBible, CC BY). Scripture quotations from the World English Bible (public domain).