5439. phulakizó
Lexical Summary
phulakizó: To imprison, to guard, to keep watch over

Original Word: φυλακίζω
Part of Speech: Verb
Transliteration: phulakizó
Pronunciation: foo-lak-ID-zo
Phonetic Spelling: (foo-lak-id'-zo)
KJV: imprison
NASB: imprison
Word Origin: [from G5441 (φύλαξ - guards)]

1. to incarcerate

Strong's Exhaustive Concordance
imprison.

From phulax; to incarcerate -- imprison.

see GREEK phulax

NAS Exhaustive Concordance
Word Origin
from phulax
Definition
to imprison
NASB Translation
imprison (1).

Thayer's Greek Lexicon
STRONGS NT 5439: φυλακίζω

φυλακίζω; (φυλακή (or φύλαξ)); to cast into prison, imprison: Acts 22:19. (Wis. 18:4; ecclesiastical and Byzantine writings.)

Topical Lexicon
Root and Range of Meaning

Derived from the noun for a guard-house or prison, the verb in Acts 22:19 expresses the deliberate act of placing someone under restraint. It is more than a static description of custody; it conveys purposeful hostility that seizes, confines, and seeks to silence.

Biblical Occurrence

Acts 22:19 supplies the sole New Testament use: “Lord, they themselves know that in every synagogue I imprisoned and beat those who believe in You” (Berean Standard Bible). Spoken by the apostle Paul while recounting his pre-conversion zeal, the verb depicts an aggressive campaign against believers, carried out with legal authority yet in spiritual blindness.

Historical Background: Jewish and Roman Imprisonment

First-century Judaism possessed limited penal powers. Synagogue leaders could scourge (Matthew 10:17) and hand suspects to the Sanhedrin, whose guard (Acts 5:18) held prisoners until Romans confirmed sentences. Rome’s system, in turn, used several grades of custody—from households (Acts 28:16), to city stocks (Acts 16:24), to the Antonia Fortress (Acts 23:10). Paul’s testimony implies he cooperated with both frameworks, dragging believers from synagogues (Acts 8:3) and delivering them to official jails (Acts 26:10).

Saul’s Zeal and Christian Persecution

Imprisonment was one weapon in Saul’s arsenal. He “was ravaging the church” (Acts 8:3) and “breathing out threats and murder” (Acts 9:1). The verb in Acts 22:19 summarizes that violent program. Yet the Lord who was “sending you far away to the Gentiles” (Acts 22:21) turned the persecutor into a prisoner for the gospel (Philippians 1:12-14). The single usage of the verb therefore anchors a dramatic reversal: the jailer becomes the jailed, the oppressor the ambassador of grace.

Theological Insights

1. Human wrath cannot thwart divine purpose. By allowing Saul’s imprisoning zeal, God prepared him to understand the plight of saints under chains and to pen letters from custody that enrich the church.
2. Persecution authenticates witness. Jesus foretold, “They will hand you over to the courts and flog you in their synagogues” (Matthew 10:17). The early church’s experience validated that prophecy and displayed steadfast faith.
3. Freedom in Christ transcends physical restraint. Though Paul later wrote as “a prisoner of Christ Jesus” (Ephesians 3:1), he saw even Roman bonds as service to the Lord, not defeat.

Ministry Applications

• Pray for persecutors. The Spirit who transformed Saul can still convert today’s oppressors.
• Prepare congregations to face legal hostility without surprise or compromise.
• Encourage believers in confinement—whether for the gospel or other reasons—that God often uses prisons as pulpits (Acts 16:25-34).
• Cherish Scripture written from chains; letters such as Ephesians, Philippians, Colossians, and Philemon prove that restricted circumstances can yield expansive ministry.

Related Scriptures for Study

Acts 5:18; Acts 8:3; Acts 9:1-2; Acts 16:23-34; Acts 26:10-11; Philippians 1:12-14; 2 Timothy 2:9; Hebrews 13:3; Revelation 2:10.

Forms and Transliterations
φυλακιζων φυλακίζων φυλάκισσαν phulakizon phulakizōn phylakizon phylakizōn phylakízon phylakízōn
Links
Interlinear GreekInterlinear HebrewStrong's NumbersEnglishman's Greek ConcordanceEnglishman's Hebrew ConcordanceParallel Texts
Englishman's Concordance
Acts 22:19 V-PPA-NMS
GRK: ἐγὼ ἤμην φυλακίζων καὶ δέρων
NAS: after another I used to imprison and beat
INT: I was imprisoning and beating

Strong's Greek 5439
1 Occurrence


φυλακίζων — 1 Occ.

5438
Top of Page
Top of Page