Ephesians 6:17

17And take the helmet of salvation
An allusion to Isa 59:17.
and the sword
The Greek term translated sword (μάχαιρα, machaira) refers to the Roman gladius, a short sword about 2 ft (60 cm) long, used for close hand-to-hand combat. This is the only clearly offensive weapon in the list of armor mentioned by the author (he does not, for example, mention the lance [Latin pilum]).
of the Spirit, which is the word of God.
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