Hebrews 3:8

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

Hebrews 3:13

3:13 But exhort one another each day, as long as it is called “Today,” that none of you may become hardened by sin’s deception.

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.”