adamant

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.

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.

His mercy is manifest to every creature; and he hath separated his light from the darkness with an adamant.

Behold now what shall come upon them in the last days, when the day of God and the day of the decision of the judgement of God cometh. From the east unto the west shall all the children of men be gathered together before my Father that liveth for ever. And he shall command hell to open its bars of adamant and give up all that is therein.

But the holy and God-fearing mother wailed not with this lamentation over any one of them, neither besought she any to escape death, nor lamented over them as dying men; but, as though she had a soul of adamant and were bringing forth the number of her sons, for a second time, into immortal life, she besought rather and entreated of them that they should die for religion's sake.

The bolts of stern and lasting adamant