KJV:
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.
NASB:
"They made their hearts like flint so that they could not hear the law and the words which the LORD of hosts had sent by His Spirit through the former prophets; therefore great wrath came from the LORD of hosts.