BSA_en_tn/eph/06/17.md

take the helmet of salvation

Salvation given by God protects the believer's mind just as a helmet protects the head of a soldier. (See: rc://en/ta/man/translate/figs-metaphor)

the sword of the Spirit, which is the word of God

The writer speaks of God's instructions to his people as if they were a sword that his people could use to fight an enemy, (See: rc://en/ta/man/translate/figs-metaphor)