adamant <EZE3 -9> As an {adamant} harder than flint have I made thy forehead: fear them not, neither be dismayed at their looks, though they [be] a rebellious house.
adamant <ZEC7 -12> Yea, they made their hearts [as] an {adamant} stone, lest they should hear the law, and the words which the LORD of hosts hath sent in his spirit by the former prophets: therefore came a great wrath from the LORD of hosts.

 
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