Verses with the word helmet in the Old Testament (6 verses):

1 Samuel 17:5
And he had an helmet of brass upon his head, and he was armed with a coat of mail; and the weight of the coat was five thousand shekels of brass.

1 Samuel 17:38
And Saul armed David with his armour, and he put an helmet of brass upon his head; also he armed him with a coat of mail.

Isaiah 59:17
For he put on righteousness as a breastplate, and an helmet of salvation upon his head; and he put on the garments of vengeance for clothing, and was clad with zeal as a cloak.

Ezekiel 23:24
And they shall come against thee with chariots, wagons, and wheels, and with an assembly of people, which shall set against thee buckler and shield and helmet round about: and I will set judgment before them, and they shall judge thee according to their judgments.

Ezekiel 27:10
They of Persia and of Lud and of Phut were in thine army, thy men of war: they hanged the shield and helmet in thee; they set forth thy comeliness.

Ezekiel 38:5
Persia, Ethiopia, and Libya with them; all of them with shield and helmet: