Hebrews 3:15

¹³ But exhort one another daily, as long as it is called today, so that none of you may be hardened by sin’s deceitfulness.

¹⁴ We have come to share in Christ if we hold firmly to the end the assurance we had at first.

As it has been said: “Today, if you hear His voice, do not harden your hearts, as you did in the rebellion.”

¹⁶ For who were the ones who heard and rebelled? Were they not all those Moses led out of Egypt?

¹⁷ And with whom was God angry for forty years? Was it not with those who sinned, whose bodies fell in the wilderness?

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

Compare

BSB: As it has been said: “Today, if you hear His voice, do not harden your hearts, as you did in the rebellion.”
KJV: While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation.
WEB: while it is said, “Today if you will hear his voice, don’t harden your hearts, as in the rebellion.”
ASV: while it is said, To-day if ye shall hear his voice, Harden not your hearts, as in the provocation.
DARBY: in that it is said, To-day if ye will hear his voice, do not harden your hearts, as in the provocation;
BLB: As it is said: “Today if you⁺ should hear His voice, do not harden your⁺ hearts, as in the rebellion.”

ÅB: Når det sies: Idag, om dere hører hans røst, da forherd ikke deres hjerter som ved forbitrelsen,
OTB: Som det har blitt sagt:
“I dag, hvis dere hører hans røst,
gjør ikke hjertene harde som under opprøret.”
B1930: Når det sies: Idag, om I hører hans røst, da forherd ikke eders hjerter som ved forbitrelsen,

Hebrews 3:7–8
Therefore, as the Holy Spirit says: “Today, if you hear His voice,
Read in context
Psalms 95:7
For He is our God, and we are the people of His pasture, the sheep under His care. Today, if you hear His voice,
Read in context
Hebrews 10:38
But My righteous one will live by faith; and if he shrinks back, I will take no pleasure in him.”
Read in context
Hebrews 10:29
How much more severely do you think one deserves to be punished who has trampled on the Son of God, profaned the blood of the covenant that sanctified him, and insulted the Spirit of grace?
Read in context