Mark 10:5

³ “What did Moses command you?” He replied.

⁴ They answered, “Moses permitted a man to write his wife a certificate of divorce and send her away.”

But Jesus told them, “Moses wrote this commandment for you because of your hardness of heart.

⁶ However, from the beginning of creation, ‘God made them male and female.’

⁷ ‘For this reason a man will leave his father and mother and be united to his wife,

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: But Jesus told them, “Moses wrote this commandment for you because of your hardness of heart.
KJV: And Jesus answered and said unto them, For the hardness of your heart he wrote you this precept.
WEB: But Jesus said to them, “For your hardness of heart, he wrote you this commandment.
ASV: But Jesus said unto them, For your hardness of heart he wrote you this commandment.
DARBY: And Jesus answering said to them, In view of your hard-heartedness he wrote this commandment for you;
BLB: But Jesus said to them, “For your⁺ hardness of heart he wrote you⁺ this commandment;

ÅB: Men Jesus sa til dem: For deres hårde hjertes skyld har han skrevet dere dette bud.
OTB: Jesus sa til dem, “Det var på grunn av deres harde hjerter at han skrev denne befaling til dere.
B1930: Men Jesus sa til dem: For eders hårde hjertes skyld har han skrevet eder dette bud.

Matthew 19:8
Jesus replied, “Moses permitted you to divorce your wives because of your hardness of heart; but it was not this way from the beginning.
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Acts 7:51
You stiff-necked people with uncircumcised hearts and ears! You always resist the Holy Spirit, just as your fathers did.
Read in context
Nehemiah 9:16–17
But they and our fathers became arrogant and stiff-necked and did not obey Your commandments.
Read in context
Nehemiah 9:26
But they were disobedient and rebelled against You; they flung Your law behind their backs. They killed Your prophets, who had admonished them to return to You. They committed terrible blasphemies.
Read in context
Hebrews 3:7–10
Therefore, as the Holy Spirit says: “Today, if you hear His voice,
Read in context
Deuteronomy 31:27
For I know how rebellious and stiff-necked you are. If you are already rebelling against the LORD while I am still alive, how much more will you rebel after my death!
Read in context
Deuteronomy 9:6
Understand, then, that it is not because of your righteousness that the LORD your God is giving you this good land to possess, for you are a stiff-necked people.
Read in context