NET

12 Indeed, they made their hearts as hard as diamond, so that they could not obey the law of Moses and the other words the Lord of Heaven’s Armies had sent by his Spirit through the former prophets. Therefore, the Lord of Heaven’s Armies poured out great wrath.

Darby

12 And they made their heart [as] an adamant, that they should not hear the law, and the words that Jehovah of hosts sent by his Spirit by the hand of the former prophets: therefore was there great wrath from Jehovah of hosts.

KJV

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.