Zealous jealousy is the burning, possessive love God Himself confesses for His people — the fire that will not share the bride with another. "Thou shalt not bow down thyself to them, nor serve them: for I the LORD thy God am a jealous God" (Exodus 20:5); "For the LORD thy God is a consuming fire, even a jealous God" (Deuteronomy 4:24); "the LORD, whose name is Jealous, is a jealous God" (Exodus 34:14). Scripture insists that jealous is one of God’s names, not a defect. It is the Husband’s right reaction to the Bride’s wandering eye. The same fire Paul wishes to see in pastors over their flocks: "I am jealous over you with godly jealousy" (2 Corinthians 11:2).
(Composite.) An ardent, exclusive, righteous concern; the holy possessiveness God shows toward His covenant people.
Webster: jealous — “suspicious; apprehensive of rivalship; intolerant of rivalship.” Of God: anxious to preserve the affections of His people from rival objects.
Zealous: warmly engaged; ardently desirous. Joined, the phrase names a love so committed that it cannot tolerate divided affection.
Exodus 34:14 — "For thou shalt worship no other god: for the LORD, whose name is Jealous, is a jealous God."
Deuteronomy 4:24 — "For the LORD thy God is a consuming fire, even a jealous God."
Zechariah 1:14 — "I am jealous for Jerusalem and for Zion with a great jealousy."
2 Corinthians 11:2 — "For I am jealous over you with godly jealousy: for I have espoused you to one husband."
Modern usage has divorced jealousy entirely from zeal and made both words ugly; Scripture restores them as the language of holy love.
Greek uses one word, zēlos, for both. The English split is mostly an accident of usage: zeal kept the noble side, jealousy kept the suspicious side. Scripture refuses the split — God is jealous, and that is praise, not pathology.
Paul shows the New Testament version (2 Cor 11:2): the apostle, like the Father, is jealous over a betrothed bride for one husband. To call God jealous is to confess that His love for you is exclusive, possessive, and burning — the only kind of love worth wanting.
Hebrew and Greek have a single word that English sometimes translates as zeal, sometimes as jealousy — the same fire either way.
H7068 — קִנְאָה (qinah) — jealousy, ardor, zeal; the Lord's burning love for His covenant people.
G2205 — ζῆλος (zēlos) — zeal, jealousy; root of both English words, depending on context.
"God is jealous for you — that is praise, not problem."
"Zeal and jealousy are the same fire turned to a different object."
"The Husband who is not jealous does not love."