Hebrews 3:8

3:8 “Do not harden your hearts as in the rebellion, in the day of testing in the wilderness.

Hebrews 3:15

3:15 As it says, “Oh, that today you would listen as he speaks! Do not harden your hearts as in the rebellion.”

Hebrews 4:7

4:7 So God again ordains a certain day, “Today,” speaking through David after so long a time, as in the words quoted before, “O, that today you would listen as he speaks! Do not harden your hearts.”