Exodus speaks of the Breastplate the Priests work:
Exodus 25:7, 28:4,15,22-30, 29:5, 35:9,27, 39:8-9,15-21 and Leviticus 8:8
Isaiah writes of the Redeemer that shall come to Zion:
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.
Paul speaks of our defense in the spiritual battle:
Ephesians 6:14 Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness;
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.
The battle of Armageddon:
Revelation 9:9 And they had breastplates, as it were breastplates of iron; and the sound of their wings was as the sound of chariots of many horses running to battle.
Revelation 9:17 And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire, and of jacinth, and brimstone: and the heads of the horses were as the heads of lions; and out of their mouths issued fire and smoke and brimstone.