Hebrews 3:10

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

⁹ When your fathers tempted me, proved me, and saw my works forty years.

Wherefore I was grieved with that generation, and said, They do alway err in their heart; and they have not known my ways.

¹¹ So I sware in my wrath, They shall not enter into my rest.)

¹² Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.

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

Compare

BSB: Therefore I was angry with that generation, and I said, ‘Their hearts are always going astray, and they have not known My ways.’
KJV: Wherefore I was grieved with that generation, and said, They do alway err in their heart; and they have not known my ways.
WEB: Therefore I was displeased with that generation, and said, ‘They always err in their heart, but they didn’t know my ways.’
ASV: Wherefore I was displeased with this generation, And said, They do always err in their heart: But they did not know my ways;
DARBY: Wherefore I was wroth with this generation, and said, They always err in heart; and *they* have not known my ways;
BLB: Therefore I was angry with this generation, and I said, ‘Always they go astray in their heart; and did not know My ways;’

ÅB: derfor harmedes jeg på denne slekt og sa: De farer alltid vill i hjertet; men de kjente ikke mine veier,
OTB: Derfor var jeg vred på den generasjonen,
og sa: ‘Deres hjerter går alltid på avveie,
og de har ikke kjent mine veier.’
B1930: derfor harmedes jeg på denne slekt og sa: De farer alltid vill i hjertet; men de kjente ikke mine veier,

Psalms 95:10
Forty years long was I grieved with this generation, and said, It is a people that do err in their heart, and they have not known my ways:
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2 Thessalonians 2:10–12
And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
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Psalms 78:8
And might not be as their fathers, a stubborn and rebellious generation; a generation that set not their heart aright, and whose spirit was not stedfast with God.
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Psalms 67:2
That thy way may be known upon earth, thy saving health among all nations.
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Jeremiah 4:22
For my people is foolish, they have not known me; they are sottish children, and they have none understanding: they are wise to do evil, but to do good they have no knowledge.
Read in context
Ephesians 4:30
And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.
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Isaiah 63:10
But they rebelled, and vexed his holy Spirit: therefore he was turned to be their enemy, and he fought against them.
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Hosea 4:12
My people ask counsel at their stocks, and their staff declareth unto them: for the spirit of whoredoms hath caused them to err, and they have gone a whoring from under their God.
Read in context