Exodus 39:14
And the stones were according to the names of the children of Israel, twelve, according to their names, like the engravings of a signet, every one with his name, according to the twelve tribes.
Cross-reference
Revelation 21:12
Typology
Revelation 21:12 depicts the New Jerusalem's gates inscribed with the twelve tribes' names, echoing the breastpiece's stones engraved with the same names.