King James Version (KJV)

Hebrews 3:15

“While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation.”

Verse in context — Hebrews 3

But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.

For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end;

While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation.

For some, when they had heard, did provoke: howbeit not all that came out of Egypt by Moses.

But with whom was he grieved forty years? [was it] not with them that had sinned, whose carcases fell in the wilderness?

Jesus as the ultimate High Priest and fulfillment of the Old Covenant.