Mark 10:5

And Jesus answered and said unto them, For the hardness of your heart he wrote you this precept.
— Mark 10:5, King James Version

In other translations

World English Bible (WEB)

But Jesus said to them, "For your hardness of heart, he wrote you this commandment.

American Standard Version (ASV)

But Jesus said unto them, For your hardness of heart he wrote you this commandment.

Young's Literal Translation (YLT)

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