Helmet: Figurative
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Isaiah 59:17
He put on righteousness like a breastplate, and the helmet of salvation on His head; He put on garments of vengeance and wrapped Himself in a cloak of zeal.
Ephesians 6:17
And take the helmet of salvation and the sword of the Spirit, which is the word of God.
1 Thessalonians 5:8
But since we belong to the day, let us be sober, putting on the breastplate of faith and love, and the helmet of our hope of salvation.