(Heb. kob’a), a cap for the defence of the head (1 Sam. 17:5, 38). In the New Testament the Greek equivalent is used (Eph. 6:17; 1 Thess. 5:8). (See ARMS.)
Helmet
The helmet shows up first as ordinary gear for soldiers: Goliath wore one of brass, and Saul put one on David before David chose his sling instead. Uzziah supplied his army with helmets, and Jeremiah’s call to war names them as well. Then the picture turns. God himself puts on “an helmet of salvation” in Isaiah, and Paul tells believers to “take the helmet of salvation” and, elsewhere, to wear “the hope of salvation” for a helmet. In both letters the armour protects the mind and heart rather than the body. Ephesians 6 sets the whole kit side by side.
7 verses
1 Samuel
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.
2 Chronicles
2 Chronicles 26:14
And Uzziah prepared for them throughout all the host shields, and spears, and helmets, and habergeons, and bows, and slings to cast stones.
Isaiah
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 cloke.
Jeremiah
Jeremiah 46:4
Harness the horses; and get up, ye horsemen, and stand forth with your helmets; furbish the spears, and put on the brigandines.
Ephesians
Ephesians 6:17
And take the helmet of salvation, and the sword of the Spirit, which is the word of God:
1 Thessalonians
1 Thessalonians 5:8
But let us, who are of the day, be sober, putting on the breastplate of faith and love; and for an helmet, the hope of salvation.
From Easton's Bible Dictionary
Matthew George Easton, 1897