Mark 10:5

Then Jesus answering said unto them, For the hardness of your hearts he wrote you that ordinance.

Matthew 19:8

He saith unto them, It was on account of the hardness of your hearts that Moses gave you permission to put away your wives: but from the beginning it was not thus.

Acts 7:51

Ye stiff-necked and uncircumcised in heart and in ears, ye do always oppose yourselves against the Holy Ghost: as your fathers, so are ye.

Hebrews 3:7-10

Wherefore, as the Holy Ghost saith, To day if ye will hear his voice,

Treasury of Scripture Knowledge

Summary

And Jesus answered and said unto them, For the hardness of your heart he wrote you this precept.

Bible References

For

Matthew 19:8
He saith unto them, It was on account of the hardness of your hearts that Moses gave you permission to put away your wives: but from the beginning it was not thus.
Acts 7:51
Ye stiff-necked and uncircumcised in heart and in ears, ye do always oppose yourselves against the Holy Ghost: as your fathers, so are ye.
Hebrews 3:7
Wherefore, as the Holy Ghost saith, To day if ye will hear his voice,