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, ¹  “Oh, that today you would listen as he speaks! ²  Do not harden your hearts as in the rebellion.” ³ 

[3:15]  ¹ tn Grk “while it is said.”

[3:15]  ² tn Grk “today if you hear his voice.”

[3:15]  ³ sn A quotation from Ps 95:7b-8.