'Stiffness' in the Bible

He saith to them -- 'Moses for your stiffness of heart did suffer you to put away your wives, but from the beginning it hath not been so.

And Jesus answering said to them, 'For the stiffness of your heart he wrote you this command,

Afterwards, as they are reclining (at meat), he was manifested to the eleven, and did reproach their unbelief and stiffness of heart, because they believed not those having seen him being raised;