Bible: Hearts Harden As

Repeated words found across different books in the Bible (KJV):
Josh 11:20
For it was of the LORD to harden their hearts, that they should come against Israel in battle, that he might destroy them utterly, and that they might have no favour, but that he might destroy them, as the LORD commanded Moses.

1Sm 6:6
Wherefore then do ye harden your hearts, as the Egyptians and Pharaoh hardened their hearts? when he had wrought wonderfully among them, did they not let the people go, and they departed?

Heb 3:8
Harden not your hearts, as in the provocation, in the day of temptation in the wilderness:

Heb 3:15
While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation.

Heb 4:7
Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts.